Car Ac Making Hissing Noise And Not Cooling

Some homes do not have this secondary line, and this is where a homeowner can become confused as to why his air conditioning stopped working. It seems to only occur Central AC making a hissing noise (converting, installed, gas, condo) - House -remodeling, decorating, construction, energy use, kitchen, bathroom, bedroom, building, rooms - City-Data Forum. The sound does not sound like humming if I stand next to the compressor unit outside. The sound is VERY annoying, but has not effected the performance of the vehicle. As the car ages things tend to get out of alignment. The air conditioner has not been running. My air conditioner is not working as well as I remember it either. Oct 04, 2012 · 1977-1982 Corvette Air Condition Control Repair & Installation: The repair is very simple. 10 seconds, then turn off the air-conditioning system for approx. The hissing sound is caused by equalizing pressure. A chugging noise could mean a blockage in the exhaust system. But for your convenience, we'll categorize the problems into ones YOU can solve and ones only a professional air conditioning repair technician can. What you least want on a hot summer day is an air conditioner that can’t cool. it is even louder right after I switch off the engine (with the aircon not switched of prior). What's That Sound? Noises Your AC Makes and When It Means There's a Problem. This problem is intermittent but is getting nore frequent. But the warranty is up because it is 3 yr. But because of wear and tear, your AC can lose refrigerant due to leaks. If your vehicle is an orifice tube system, the refrigerant gas will flow through one of the open compressor reed valves. In other words, if I was accelerating and the RPMS went up, (and the hissing slowed or stopped), I would get reasonably cold air. Apr 26, 2014 · Problem: My heat pump is making a funny hissing noise. It is not really loud and if the music is loud enough you would not hear it but I know its there just trying to figure out where its coming from. The heater core works in conjunction with your engine’s cooling system. No problems there. Probably your fan belt is a bit slack. An AC compressor not turning on can be a major problem because it narrows your choices: Sleep in a sweltering sweat box or go over to your in-laws. This problem is intermittent but is getting nore frequent. What is an A/C Compressor Bypass Pulley and where is it Installed? An A/C compressor bypass pulley is a quick fix to quiet a car or truck’s noisy A/C compressor. So the vent doors struggle a bit more to open and close. Only developed this summer. What's causing the hissing noise coming from my air conditioner? 2 Answers. Air conditioning sensors and switches. Jul 07, 2011 · Every once in a while I receive a call from a customer that is hearing a hissing noise coming from their air conditioner. Oct 22, 2015 · Your AC System Is Making a Hissing or Bubbling Noise Because air conditioners do not technically use up refrigerant like gas, the primary reason for low levels of refrigerant is a leak. There is a hissing noise coming from the unit where the refrigerant lines go into the evaporator. But for your convenience, we'll categorize the problems into ones YOU can solve and ones only a professional air conditioning repair technician can. Among the possible causes are leaky refrigerant lines, an internal valve leak or a serious issue with your compressor. The most common cause of window air conditioners not blowing cold air is a lack of adequate air flow. Sep 08, 2014 · Even the quietest modern air conditioners make some noise as they cool your home, but there are some sounds your AC just shouldn’t be making. Miata Noises, Squeaks, & Sounds. One of the most common summer issues that car owners face is a malfunctioning air conditioning system, and you don’t want to get stuck in California triple digit heat without AC. Most likely cause: Your compressor. If you notice a drop in cooling power from your AC, hear a hissing noise from the condenser, or notice frost along the unit, call for repairs immediately. Do you get cold air from it? Yes, I do. Refrigerant is necessary for the cooling process and is known to make a hissing noise if it is. Clicking, banging, clanking and hissing sounds are signs of trouble, and if you hear them, you’ll need to take action to identify and resolve the problem. A loose belt is best identified by the loud screeching noise it makes. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC. Finally, if you hear a hissing noise near the copper tubing coming from your outdoor unit, you might have a refrigerant leak. High-efficiency units incorporate sound-dampening technology and two-stage compressors to produce noise levels below 69 decibels. If a refrigerant leak develops, you may hear a light hissing sound as the refrigerant escapes through the leak. Planning the location of the outdoor unit is very important so as not to impact on your neighbours and yourself. Mufflers can also make this type of noise. Jul 18, 2019 · If you are hearing a hissing noise coming from your air conditioning unit, it could be caused by a refrigerant leak. I turned my car back on and noticed I could hear it a bit in the car as well. There can be several reasons behind AC not cooling problem, some of which are technical faults and some are non- technical. Then use a leak dye light (black light) and check to see where a leak is and fix as required. People would frequently turn their thermostats down very low in hopes that this would make the AC respond more quickly or work harder. I have taken his word but am not too sure. The system will overflow 2 to 3 times. My car's ac makes a hissing noise when the ac is engaged. Electrical Issues. After taking delivery of the car, I couldnt help but notice a hissing sound coming when the AC runs, I was afraid it was a gas leak. Failing hoses make hissing noises or leak fluids and most of the time this noise is barely audible above the engine hum so you have to listen closely. If a refrigerant leak develops, you may hear a light hissing sound as the refrigerant flees through the leak. It sounds like the dinging sound an older GM car makes when you leave the keys in the ignition and open the door. Also, the noise seems more substantial when cruising at highway speeds or slowly accelerating from a stop, not which the turbo would be spooling up. The AC used to be excellent in defrost mode but a few months ago I would hear a hissing sound inside the vehicle when the AC was on and now the only way to clear the fog from inside the windows on a cool wet day is to run the manual defrost at the highest fan speed and wait a few minutes for the heat and airflow to clear the inside of the windshield. Say you've been out running errands on a hot summer day in Texas. I took the car to the mechanic who re-gassed the AC system and now when I turn on the AC there is a hissing noise from the engine bay just below the alternator. did you hear the hissing now?. Worn fan-belt pulleys make a sound that increases with speed. Stuck & Blend Air Door. While some of the problems above might be minor at first, they can turn into much bigger issues the longer you ignore them. Some parts of your engine can create a hissing sounds and be perfectly normal. "Worked Like a Champ!" Used this to fill a new A-C system. While driving at 55 mph, the contact noticed fluid leaking out of the air vents. Apr 02, 2014 · Finally, if you have a loose drive belt, your air conditioner will not function at its best. But A/C is more than just comfort; it's a safety issue too. The van only has 29,083 miles on it. Carry out a system. If there is no object present or the air conditioner rattling persists, then that noise may indicate one or more possible problems with the climate control system. It is the refrigerant that makes the warm air cold, which is sent out. Air conditioner's indoor unit making noise. The cooling system involves various elements, including the radiator and even the coolant. Apr 26, 2014 · Problem: My heat pump is making a funny hissing noise. People would frequently turn their thermostats down very low in hopes that this would make the AC respond more quickly or work harder. The hissing sound of the air venting from the valve is a sign of normal operation but should stop once the radiator comes up to temperature and the valve closes, thereby retaining steam in the radiator. It costs around Rs 600 to 800 additional and aids in better lubrication to compressor and cooling components of car. Occurs at the outside air conditioning unit when the AC first turns on. Brief hissing sounds. Your air conditioner's blower constantly circulates air in your home. How much horsepower does a car's air conditioning compressor use? Should I be concerned if my home air conditioner compressor is blowing cold air? What can you tell me about defects in flex duct air conditioning? What could be causing a hissing sound from an air conditioner? Why is my air conditioner not turning on?. May 31, 2018 · The problem of a car air conditioner blowing hot air on one side is mostly seen in cars which have a dual zone climate control system. It blows out cold air. The car does mot lose power while making the noise but the engibe turns off intermittently. Troubleshooting air conditioning isn’t difficult. Your car's AC system has two sides separated by a valve. Fan isn't spinning and loud hissing noise. There is a hissing noise coming from the unit where the refrigerant lines go into the evaporator. This guide will contain information on how to recharge your air conditioner with refrigerant 134a or r-134a. Among the possible causes are leaky refrigerant lines, an internal valve leak or a serious issue with your compressor. Air Conditioning Trouble Shooting FAQ's from Vintage Air The following guide will help the installer determine if a problem exists in the system that would cause a malfunction. The air condition in my 98 Mercedes E320 makes a loud seeping/hissing noise when turning on the a/c. A loose fan belt repair is not for an air conditioning novice so make sure to call a professional technician if yours needs to be replaced. Repeat this procedure at least 5 times. If there is a hissing. We'll look at the most likely component first, then consider other parts that are potential noisemakers. The hissing sound is most likely the refrigerant going through the expansion valve. Hi, I have a 2006 jetta TDI with 180,000 miles,at idle have a hissing and rattling sound, does this sound like a egr cooling valve problem? Drove over 100k mile since i notice this sound, now is getting worse, when I accelerate goes away. Then the heater started only blowing cold air in the mornings. There are times, though, where you might hear a squealing noise when you engage the air conditioning system. If that's the case, you may also notice that your system is running more often and not cooling as well. If the parts are not replaced, the car will also begin to bounce during turns. If you notice a drop in cooling power from your AC, hear a hissing noise from the condenser, or notice frost along the unit, call for repairs immediately. Hissing or bubbling: A serious refrigerant leak can produce hissing noises in the compressor. There were multiple leaks at the black clamps that hold the lines to the body (design flaw?). During normal operation, refrigerant runs in a closed loop in your AC system. In a properly working air conditioner, the motorized fan will pull air through the filter and over the cold evaporator coils and then re-circulate the cooled air back into the room. They can move from room to room, yes, but the setup of a portable AC makes it difficult to do so with any ease. in our house. The AC used to be excellent in defrost mode but a few months ago I would hear a hissing sound inside the vehicle when the AC was on and now the only way to clear the fog from inside the windows on a cool wet day is to run the manual defrost at the highest fan speed and wait a few minutes for the heat and airflow to clear the inside of the windshield. Obviously something isn't right with it, and I know I need to get it looked at. When I turn on the AC it just blows warm air and makes a hissing noise from the dash vents. Hissing present, air is warm. We'll look at the most likely component first, then consider other parts that are potential noisemakers. The van only has 29,083 miles on it. Also, if the air conditioner was not working for a long time, you may have just forgotten what it sounds like, though you would be the best judge of that. Clean blower, resistor set, etc. Here are some of the most common reasons. Air conditioning sensors and switches. The heater core works in conjunction with your engine’s cooling system. Dec 24, 2012 · Maintain Your Car; Figo A/C evaporator coil problem; As I started hearing the hissing sound, I stopped using the AC. Most likely cause: Your compressor. Today while driving the air conditioning in our 2014 GMC Savana Cutaway Box Truck stopped blowing air and started making a hissing noise. For over three decades, we have been repairing air. With the push to get more …. I would drive for 10-12 mins when it sould come on. Air in the lines doesnt cool the engine at all and can cause more overheating, plus inefficient coolant flow. This problem is intermittent but is getting nore frequent. My central AC air conditioner system works very well. Ive done oil change yet still the same. Question about humming sounds from the air conditioner: I have a 13 year old Armstrong AC, 4 ton, 10 S. why does my computer make so much noise when it is running? It sounds like a fan running at high speed. Indoor Blower. When the compressor is not working, air conditioning of any kind comes to a stop. When Hissing Isn’t a Problem. They have new air conditioning control head switches in stock along with new control dials. SuperUser reader Rishat Muhametshin wants to know why some of his AC adapters and power supplies make a whining noise: I have many different AC adapters and power supplies for a variety of devices, ranging from small 5V/1A USB chargers to laptop power adapters and desktop PSUs. Everything seems to be working fine but it makes a noise like it's on a ventilator machine or gasping for air or something to that effect. PT Cruiser Owner Complaints: PT Cruiser Year 200 6 PT Cruiser Model Standard Found your website the other day in search for the answer to the problem your website talks about. When your car's air conditioner isn't working, it can make for an uncomfortable ride on a warm day. Learn how they work together to remove the heat from your automobile. Had it off for the whole winter and barely turned it on, the only thing that came out was hot air and a hissing noise from the engine. Dec 28, 2002 · Air conditioner unit making annoying bubbling noise. More often than not, the fan motor in the condenser outside has quit working. I noticed this sound after the car had done 35K kms. When the air conditioning in your car blows out a burning plastic smell, you should check your car or have it looked it by a mechanic. Dec 15, 2015 · From what you describe this sounds like you probably have a heat pump unit and the noise that you are hearing is probably the heat pump going into defrost mode. 2008 GMC Acadia SLT. Dan's Vlog 373,067 views. The ac still cools but does not cool as well as it did a few months ago. The most recently reported issues are listed below. But not before starting the truck from cold. Avoiding a catastrophe like this simply requires you to pay attention to the signs coming from your AC system. Refrigerant leaks produce all kinds of air conditioning problems, including many that affect the performance of your compressor. My car's ac makes a hissing noise when the ac is engaged. Clicking, banging, clanking and hissing sounds are signs of trouble, and if you hear them, you’ll need to take action to identify and resolve the problem. A hissing noise coming from your HVAC system is not something to be overlooked. May 06, 2014 · Hissing‑A hissing or whistling noise could also be due to a problem with ductwork. Do you hear your air conditioner making a humming noise? An AC hum is usually not a concern, unless the sound varies greatly from its typical sounds. But for your convenience, we’ll categorize the problems into ones YOU can solve and ones only a professional air conditioning repair technician can. Brief hissing sounds. Undersized return grills and return ducts are unfortunately very common. People would frequently turn their thermostats down very low in hopes that this would make the AC respond more quickly or work harder. SuperUser reader Rishat Muhametshin wants to know why some of his AC adapters and power supplies make a whining noise: I have many different AC adapters and power supplies for a variety of devices, ranging from small 5V/1A USB chargers to laptop power adapters and desktop PSUs. 5 to 2011, read on with great interest or concern. A lot can be learned by listening to your engine, so if your car starts to change its tune, you should take heed. Dec 15, 2014 · FREE FIX - How to Diagnose and Adjust an A/C Compressor Clutch in Car Truck - Blows Cold Then Warm - Duration: 23:20. A lot can be learned by listening to your engine, so if your car starts to change its tune, you should take heed. I can only hear it in the bedroom. What's bad here is the damage to your car caused by the collision. If you have a musty smell in your basement (or wherever you store the air conditioning unit), it’s likely the cause of a water leak. Oct 04, 2012 · 1977-1982 Corvette Air Condition Control Repair & Installation: The repair is very simple. Your air conditioner has normal operational sounds, one of which may be short, small hiss noises. Any Thoughts. When I use only the vent, the noise isn't there; only when I actually turn on the A/C. The first thing to assess is where the noise is coming from. Start by contacting Zip Corvette Parts, 8067 Fast Lane, Mechanicsville, VA 23111, 1-(800)-962-9632. When I turned it on for the first time, I heard a hissing noise from the center vents on the dash. Dec 19, 2012 · Car A/C is making a hissing sound and not blowing cold? I drive a 2011 Hyundai Sonata. Such systems allow you to control the temperature in the passenger compartment of the cars as per your comfort level. If you notice a drop in cooling power from your AC, hear a hissing noise from the condenser, or notice frost along the unit, call for repairs immediately. The A/C in my car has been making a hissing noise for about the past two weeks. Generally speaking, the sounds coming from your air conditioning unit should blend into the background. Hissing/bubbling noise. As long as you've been paying attention, nobody knows how your engine sounds better than you do, so if it starts to sound odd or even just a little different, there could be a problem. Except that it was slipping and making a terrible noise. A hissing noise coming from your HVAC system is not something to be overlooked. Is that grinding sound from my AC a warning sign? Strange noises are one of the ways you can tell if your air conditioner is encountering trouble. It is audible through the air vents, it's louder on a hot day, and comes on every 20 seconds and runs for six seconds. I too had a grinding noise from my AC compressor, or so I thought. Hissing‑A hissing or whistling noise could also be due to a problem with ductwork. AC is hissing a lot again. I have a 2006 Ford Ranger, and it has ran great up to this point. If your window air conditioner has been operating at a steady noise level but suddenly starts making a loud noise, it's possible a foreign object has fallen into it. Wheel vibration with speeds in excess of 50 mph 4. In some cases it will not idle without feathering the gas pedal. As the car ages things tend to get out of alignment. The van only has 29,083 miles on it. When a heat pump goes into defrost the reversing valve will shift into cooling mode so the outdoor unit will be defrosted. The fridge or freezer is in a way an air conditioner as well. A hissing sound is usually associated with the compressor, the reversing valve and the freon. Does that sound right?. Your first examination after confirming that there's a hiss someplace should be visual. ACs don't yet come with computerized systems that analyze malfunctions and report to homeowners with a full diagnostic on the problem and how to address it. by Bob O’Neill and Bob Lincoln. Also, the noise seems more substantial when cruising at highway speeds or slowly accelerating from a stop, not which the turbo would be spooling up. They also replaced the oil filter. The simple rush of air forced through by the fan could result in a hissing sound because the ducts are excellent for carrying sound. Crap in heater box or blower. Your air conditioner has a set of indoor coils that absorb heat from your home’s air, as well as a set of outdoor coils that transfer heat from your home to the outdoors. Wind noise, passenger and driver side 2. If youre not comfortable doing this (its usually a screw at the highest point in the cooling system) youre potentially causing more damage to the car. That noise is caused by refrigerant escaping from one of the refrigerant lines. Problem: My heat pump is making a funny hissing noise. In the past I have gently taped the valve with the handle of a hammer. I checked out the ac compressor but it does seem that everything is doing fine so the ac should be on. Installation and Maintenance. when I call for AC, the. The steering wheel started to making some strange noise, which I was told by dealer that would cost me more than $1000 to repair. Chilled Water Air Conditioning. AC now blows ICE COLD. If that’s the case, you may also notice that your system is running more often and not cooling as well. Oct 20, 2008 · Hissing is due to low gas pressure. June 12, 2017 : Followup from the Pelican Staff: I would have someone locate the leak with a leak detector. The cooling system involves various elements, including the radiator and even the coolant. Also, if the air conditioner was not working for a long time, you may have just forgotten what it sounds like, though you would be the best judge of that. Air conditioning problems can be costly to diagnose and repair. 5V TDI and when we were test driving the car, I didn't actually notice this issue since we didn't do extensive driving and I wasn't listening for this problem specifically. in our house. The garage person told me that its the condensor bearings making the noise and that he will refill the gas if its a leak problem. Hi there Diane,. Apr 24, 2019 · To fix your car's air conditioner, start by turning your car on and checking to see if the air conditioner is producing cold air. Hissing sound is a pressure valve making noise because of the decreased amount of refrigerant. The compressor has a big motor that, as you know, makes a lot of noise under normal conditions and also creates a lot of vibration. A hissing noise could be a sign of the following AC problems: Duck leak; Bad expansion valve; Air filter that doesn't fit correctly in its slot … but most likely, the hissing noise is a sign of a refrigerant leak. When the ice buildup on evaporator coils happens, the compressor stops. May 05, 2016 · It is not always a technical fault that may lead to less cooling or an ineffective AC. As far I know not for the evporator expansion valve there is hardly any noise. Asked in Car Sounds , Heating AC and Engine Cooling , Chevy Astro. With the power to your air conditioner turned on and your thermostat not calling for cooling, hold the rubber-insulated end of the screwdriver and use the other end to hold in the “button” (circled in red in the image below) on the contactor for 5-10 seconds to manually close the circuit. Air conditioning systems are very expensive to replace and that little noise could turn in to something big if not addressed quickly. Apr 09, 2018 · Common reasons a car's AC isn't cooling. The Air Conditioner Compressor Is Making Noise. So, I have 100K miles on a 2007 4Runner (V6) and after having my radiator flushed at the Toyota dealership service dept, I get my car back and now hear a low rumbling noise coming from the engine compartment. The sound is similar to when you first switch to "DEFROST" on the climate controller in any other car. If you hear hissing, or worse, shrieking, coming from your compressor, turn off your air conditioner immediately and call a technician; do not restart your air conditioner until it has been looked at by a professional. Also try it under different conditions, like driving faster/slower, with the AC at different settings, etc. What parts can truck air conditioning systems need? Not all truck or car air conditioning systems need completely new assemblies or compressor kits to improve performance. Hi there Diane,. Sure, there might be a bundle of rattle snakes living under the hood but if your car or truck's engine makes a hissing sound it could also be an indication of a leak, either in the cooling. If its not making a noise and the noise is coming from the cab, compressor is fine for now. Also, if the air conditioner was not working for a long time, you may have just forgotten what it sounds like, though you would be the best judge of that. May 30, 2017 · It costs around Rs 600 to 800 additional and aids in better lubrication to compressor and cooling components of car. Air conditioning units make a lot of noise. Contact Hydes whenever your air conditioner is making noise. 2008 GMC Acadia SLT. They also replaced the oil filter. The sound stopped when the AC was turned off. Another cause could be twigs or leaves that have clogged your system. Those devices include an alternator, power steering pump, water pump, air conditioning compressor and the radiator fan. Possible solutions when your car AC smells like burning plastic:. The compressor in your air conditioner needs a specific amount of voltage at a specific amperage in order to start running properly. Apr 02, 2018 · Symptoms of an air conditioner refrigerant leak. And, when it senses any issue, AC is the first thing to get shut-off. If it is not working correctly, it can make life miserable in a very short time as your home heats up. The steering wheel started to making some strange noise, which I was told by dealer that would cost me more than $1000 to repair. If your air conditioner is making a squealing or squeaky noise, more than likely the fan belt is loose. It's not cooling, either. It's fixed now, and I am damn happy it did not result in a spectacular failure on some deserted highway in Idaho. Has anyone had this issue before? When I turn the AC on there is a hissing sound coming from the left rear somewhere. What you least want on a hot summer day is an air conditioner that can’t cool. When they are installed properly they will. But for your convenience, we'll categorize the problems into ones YOU can solve and ones only a professional air conditioning repair technician can. May 16, 2014 · Older car AC systems would take a few HP out of the engine (does not sound much but is a lot at tickover, low revs) - later designs are lighter/ more compact /draw less power/ have less of a negative effect on MPG, but do not go as cold/ are not as powerful as older AC systems. Even a very small leak can produce a loud hissing noise. Oct 28, 2014 · The Question. I took it to recharge the air and was told it could probably be a slow leaking evaporator. It wasn't cooling, so we had a tech out who said it had a bad scharder valve and run cap. On my 2003 Kia Sedona minivan, the air conditioning recently stopped working. Squealing Noise. It sounds like you have air in your power steering system. A rattling noise can mean that your air conditioner is starting to deteriorate, and some of its parts are loosening. Jumped it, drove about 4 miles, and while parked at a gas station with the engine running, there was an incredibly loud noise coming from the vicinity under the AC compressor and the engine started to smoke badly. If the air conditioner does not cool, the air filter might be clogged. Apr 22, 2015 · So if there’s a large refrigerant leak, you’ll hear a hissing or bubbling noise (almost like the sound when squeezing a balloon that has a hole in it). Perhaps there’s something hard to diagnose taking place with your bimmer. It sounds almost like something is stuck on the fan however, my ac blows cold air. A hissing noise coming from your HVAC system is not something to be overlooked. But when I turn it off, take the RPM to 1500 wait for 15 seconds and then turn it on again, I get this shuddering sound form the compressor which goes away in a couple of seconds. Hissing is the sound it makes to increase the pressure in the system, and as it gets lower and lower, the hissing will get more frequent. 2001 Nissan frontier. Is your BMW blowing hot air when you want AC? Not getting enough hot air when it's cold out? Well we have the heater cores, heater valves, blower motors and. A hissing AC system is not only normal but good. it is even louder right after I switch off the engine (with the aircon not switched of prior). The ac still cools but does not cool as well as it did a few months ago. Air in the lines doesnt cool the engine at all and can cause more overheating, plus inefficient coolant flow. You should also keep in mind that if your unit is older, it’s likely to be louder than a newer one. It's not constant, but I'd say it goes for at least a couple of hours a day. I have murano 2005, the car suddenly developed a fault of knocing sound after few minutes of drive both while idling and on speed. Take a few steps to determine why exactly the air conditioning is not working in your Subaru Outback. If you notice a hissing sounds from brakes while inside the passenger cabin, that's the sign of a failing vacuum booster. Normally, you should hear or feel nothing when the air conditioner is working except the cold air coming from your car's heating/cooling ducts. If you detect this noise, have the compressor checked as soon as possible since it could mean that refrigerant is being released to the environment. Jul 11, 2016 · The compressor of your air conditioning unit contains a valve. There are a variety of things that could cause your AC to not cool your home properly. #4 – Worn Steering Column Bearing. In this article, we will explain what it is and what you should do about it… The most likely cause of these noises is a refrigerant leak from your AC unit. Overheating hissing noise coming from the front of the car coolant leaking I immediately pulled over and shut off the car and the temperature started to drop when I turned the key to accessory mode and the fans started running again. If the parts are not replaced, the car will also begin to bounce during turns. You can check this by running the car with the A/C off and then listen for the click and the change in engine note when you switch the A/C on as the clutch is engaged. When the air conditioning in your car blows out a burning plastic smell, you should check your car or have it looked it by a mechanic. Need a new front plate, pulley?. When compressor stops some of the ice melts and causes small pieces to fall. If there is a hissing. When I turned it on for the first time, I heard a hissing noise from the center vents on the dash. They will. That noise is caused by refrigerant escaping from one of the refrigerant lines. May 05, 2016 · It is not always a technical fault that may lead to less cooling or an ineffective AC. A loose belt is best identified by the loud screeching noise it makes. I've noticed a sound that I'm sure is normal but I haven't noticed in previous vehicles. To avoid this, make sure you take your car in for an air conditioning system evaluation occasionally. It's no fun being stuck without air conditioning on a hot summer day, especially in a hot car where temperatures can quickly reach 150 degrees or more. A dealer found leaking in rear AC lines, and quoted me about $1800 to replace them. It's not cooling, either. The HVAC system needs to pull more air through the ducts so the pressure and velocity increases, thus increasing the sound level. I don't think the hiss is 'normal'. Is that grinding sound from my AC a warning sign? Strange noises are one of the ways you can tell if your air conditioner is encountering trouble. You will need to have refrigerant and dye added to the system and the hissing will go away. So if you want to try to figure out why your air conditioner is not working you can use the scenarios below to help you troubleshoot and repair your window air conditioner. As you turn it down the noise gets quieter and when the fan is on low the roaring noise stops. Time for normal top up. Other than making this sound it is running fine and there are no other issues/noises coming from the car. You may need to have it replaced or simply readjusted. Although this hissing noise, sounds like a bad noise, it’s actually a good air conditioning noise. But because of wear and tear, your AC can lose refrigerant due to leaks. What parts can truck air conditioning systems need? Not all truck or car air conditioning systems need completely new assemblies or compressor kits to improve performance. Problems can occur in any of the major components of. The radiators, when working correctly, do not make any hissing noise whatsoever.