Any suggestions? HELP!! One of the most common causes for a failed AC unit or one that slowly stops working is a leak in the system, this causes your cars AC to function with little to no refrigerant fluid/coolant gas. thank you so much. This could be caused by an improper refrigerant charge, faulty expansion valve, etc. Step 1: Turn on the AC. Car AC Not Blowing or Is Your Car AC Fan Not Working? it’s an auto climate but I have the max AC setting. Just yesterday, after having a shop do diagnostics and put more coolant in (was down40%), I ran on the highway for 10 minutes, very cold, then it stopped. Until it re-freezes. Acts as if vents are blocked when it runs poorly. The air conditioner … It sounds like the evaporator may be freezing up. is freezing. Yours has probably stopped working. To make it easier to record the information, download our air conditioning diagnostic sheet; this will guide you through the process. Because of … 5. The AC button has a light on the button that illuminates when the air conditioner is turned on. Stops for 2-3 minutes, … My 2002 Mazda 626 A/C stops working in hot weather (I’m in Atlanta) at random times. The engine temp is fine, and both radiator fans were still running. If your car’s air conditioner suddenly stops working, it can be incredibly inconvenient. 85-90 degree day outside. Turn the car’s fan motor on high and press the button to turn on the AC. Just a small note to remember, whenever the car is moving at freeway speeds, Freon is pumped throughout the air conditioning system more easily by the compressor compared to when the car is sitting idle. It really shouldn’t do that, you should get it checked. When an air conditioner (AC) starts and stops in quick cycles, and doesn’t run for long periods, this is known as short cycling. Since the AC condenser is located in front of the radiator, it's susceptible to damage from flying road debris and other small front-end impacts. The AC evaporator acts like a huge ice cube with holes in it. exchange the AC electronic control unit (ECU) with a new one if not any of the above steps is working; Conclusion. Let car sit for 5 hrs at destination, got in to go home, AC works fine. Powered by Discourse, best viewed with JavaScript enabled. A small refrigerant leak is the most common reason a car’s A/C gradually … At highway speeds, it practically never runs. The primary reason for which car ac is blowing hot air is when the air conditioner of the car is on it draws a load of power from the engine of the car. I'm having a strange problem with my air conditioning. The next step is to bring your car in, along with the diagnostic sheet, and have it … Your car, or any other, does not even HAVE a HVAC air filter so ignore that irrelevant comment. https://www.wiseautotools.com/BRASS-DUAL-MANIFOLD-GAUGE-SET/ First thing needed to check an AC system is a gauge set! Meanwhile, you can reduce the odds of it happening by turning the fan up (before it freezes) and setting the air to recycle or to max AC (depending on the year of your Grand Marquis and if it is manual or auto climate control). The different components that run the car AC system requires electricity to … The Condenser is Broken. The fan still blows at the same speed, but the air gets warm. The list goes on and on. Electrical Problems. While this is a relatively common issue, it should not go unchecked. Open up the hood and listen for the AC compressor and clutch to engage. Half way (or so) home AC lost efficiency again (not as badly). I’ll do what you suggest. Airman 1st Class Allen Adams, a heating ventilation air conditioning specialist, … Otherwise, you’re stuck in a hot car until you can determine why your AC isn’t working properly. What to Do If Your Car AC Stops Working. compressor clutch stops and fans do not run. All car air conditioning systems are designed to work side-by-side with the car… A condenser’s job in a vehicle is to cool the warm refrigerant that was used to make the air cold in the evaporator. by Lillie Champlin on September 14, 2019. Some of the most common auto ac repair questions that are asked are why the car’s air conditioner stops blowing air, why it stops blowing cold air, or why the AC is blowing hot air. Does your A/C work fine when you first start the car but then fail after a while, especially on hotter days? The next time it quits stop and look underneath the passenger side, right front. A Leak in the A/C System. It allows the hot, … If the coolant level should drop as the thermostat opens, top it up as necessary. If the shop did not fix the leak, but merely recharged the system, then I’d say it is still leaking, and as the refrigerant level drops it can do exactly what you describe. A car AC system is a very important part that offers comfort for drivers and passengers. A/C quits working when engine is under load. 2005 … Since 40% of the charge leaked out, there must be a leak somewhere. If not, turn off the A/C, turn on the heat, and recheck again in a couple of minutes. This should bleed off the air bubble. Then use a blacklight to find the leak and then fix the leak. When you get home, take the car to a shop specializing in automotive AC repair. Clogged Air Filter. If the pressure is too high, the effectiveness of cooling diminishes at the very least To avoid hitting issues related to this, modern air-conditioning circuits are equipped with a pressure switch/sensor. Since the A/C is not working but when I am at highway speeds and have it on after about 10 Minutes the dash makes the suction sound and then the A/C work and she blows cold. Turned fan up to high and didn’t get good air flow but you could hear the air… just not feel it, nor was temp as cool as I set it. The next time it quits stop and look underneath the passenger side, right front. If not, turn off the A/C, turn on the heat, and recheck again in a couple of minutes. So… I’m taking a trip on thursday, new jersey to michigan. It is indicative of something being wrong with your air conditioner. Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. There is a noticeable air flow increase in the condenser whenever the car is running at speeds in excess of 55 mph. As speed increases the air gets warmer. the ac blows cold then gets warm,not hot. A defective condenser fan. Since the ignition switch provides power to both accessories like your radio and your vehicle’s ignition system, a bad switch can definitely cause both to suddenly stop working. Don’t think that has anything to do with it failing on the highway though. To learn more about air conditioning compressor clutches, sample wiring diagrams, and instructions on how to test them, read this article: Air Conditioning Compressor Clutches. At a higher speed the vents start to blow again but no cooling at all. THANK YOU for answering by the way… thank you very much. The shop wanted to replace the idle control valve because it was causing the engine to start stalling at idle (AC cuts off then too). As soon as I lift the throttle, it starts cooling again. James. You should see a water condensation drip. Took a trip the other day (2 hrs) and noticed about half way there that AC wasn’t cooling well. When accelerating, my A/C stops blowing and only sometimes resumes blowing when a fairly low speed is attained. What to Do When Your Car’s Air Conditioner Stops Working by Paul Gaylo CarGurus https://www.cargurus.com If you’ve ever sat stranded in an endless traffic jam baking away on a 100-degree summer day without air conditioning, you’ll agree that a functional AC system is essential. Answer: The A/C and engine coolant systems are linked by the radiator and condensor which both sit in front of the engine and are cooled by a fan. While traveling highway as well, car will losing AC for no apparent reason. If there doesn’t appear to be anything blocking the condenser, it’s possible … When it freezes up, turn the AC off for a few minutes, but continue to run the fan. Several problems can arise with your AC. A condenser has coils and a fan to push the air through the coils and thus cool the refrigerant. Where did 40% of the refrigerant go? The refrigerant needs to be operating at the right pressures in order for the air-con to function properly: 1. This can also be labeled as MAX A/C. The cooling fan in the condenser is the first thing that you should look … However, once out of highway speeds and in city drive it stops working. Powered by Discourse, best viewed with JavaScript enabled. I didn't mention that when the compressor stops engaging both coolant fans work just the compressor stops working.I then let it sit or turn off the a/c switch for 5-10 minutes and it works great. If there is a problem with the fan, your engine will tend to overheat when in traffic (low speed) but temps should go down when at highway speeds. When sitting still or at low speed, it cools great. If the pressure is too low, there is risk of compressor damage in addition to lack of cooling 2. It's very confusing Thanks again Neil If your car’s AC isn’t blowing air, it could be a problem with your car’s fan. At a standstill the car cools well. Its job is to protect the system from self-destruction by preventing the AC from running under the wrong conditions. There is a device attached to the evaporator that’s supposed to prevent freezing. Once moving, it gets cold but periodically gets warm. They can fix it. Temp on engine was normal. 11 Answers. Add some A/C leak finder dye (must be compatible with polyol ester oil for R134a). Step 2: Decide if it’s really an air conditioning problem. It seems to do it more on very hot days. And don’t forget a dirty evaporator coil or dirty (HVAC) air filter. Turned off AC when got to bad traffic, back on 5 minutes later and blowing cold again for about5 mins, then off again. turn truck off then back on and it all works good agian for a few minutes. Start the engine with cap still open and let the engine idle for a few minutes. Emergency Service Available! This will thaw the evaporator and allow the AC to work again. Until it re-freezes. Does it fail on the highway or in stop-and-go traffic? 512-353-4770. Step 6: Find any refrigerant leaks. I suspect a problem in the vacuum operated vets. At around 45 mph the vents stop blowing, but I can still hear the fan going. A car AC compressor failure will not engage and will often lead to skipping and squealing caused by the friction of the belt. What’s my chance of getting there without roasting in my car? Most vehicles today have one multi-speed fan that blows air through a series of ducts and vents based on the driver’s selection in their climate control system. Your evaporator is freezing up. If water is streaming out the evap. Another possibility is that AC hoses and pipes can rub against other parts while you drive, eventually causing a leak. This will thaw the evaporator and allow the AC to work again. AC works fine to and from work (25 min drive). On sweltering summer days, it’s nice to turn on the air conditioning. Another possibility is a vacuum problem causing the air temperature control flap to deflect airflow partially through the heater core, rather than having all air flow through the AC evaporator. 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