Because of … 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. it’s an auto climate but I have the max AC setting. Another possibility is that AC hoses and pipes can rub against other parts while you drive, eventually causing a leak. Step 1: Turn on the AC. Turn the car’s fan motor on high and press the button to turn on the AC. AC works fine to and from work (25 min drive). Your evaporator is freezing up. Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. At around 45 mph the vents stop blowing, but I can still hear the fan going. If the coolant level should drop as the thermostat opens, top it up as necessary. Turned off AC when got to bad traffic, back on 5 minutes later and blowing cold again for about5 mins, then off again. When an air conditioner (AC) starts and stops in quick cycles, and doesn’t run for long periods, this is known as short cycling. So… I’m taking a trip on thursday, new jersey to michigan. is freezing. When accelerating or traveling at highway speed however, it stops cooling- as if the compressor clutch is releasing. Airman 1st Class Allen Adams, a heating ventilation air conditioning specialist, … When accelerating, my A/C stops blowing and only sometimes resumes blowing when a fairly low speed is attained. Acts as if vents are blocked when it runs poorly. The next step is to bring your car in, along with the diagnostic sheet, and have it … 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. 2005 … It allows the hot, … The AC button has a light on the button that illuminates when the air conditioner is turned on. Open up the hood and listen for the AC compressor and clutch to engage. If there doesn’t appear to be anything blocking the condenser, it’s possible … The list goes on and on. It really shouldn’t do that, you should get it checked. You should see a water condensation drip. Until it re-freezes. The Condenser is Broken. And don’t forget a dirty evaporator coil or dirty (HVAC) air filter. THANK YOU for answering by the way… thank you very much. Its job is to protect the system from self-destruction by preventing the AC from running under the wrong conditions. 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. I’ll do what you suggest. When sitting still or at low speed, it cools great. It seems to do it more on very hot days. The engine temp is fine, and both radiator fans were still running. Your car, or any other, does not even HAVE a HVAC air filter so ignore that irrelevant comment. compressor clutch stops and fans do not run. Step 2: Decide if it’s really an air conditioning problem. All car air conditioning systems are designed to work side-by-side with the car… The AC evaporator acts like a huge ice cube with holes in it. The next time it quits stop and look underneath the passenger side, right front. 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. A car AC system is a very important part that offers comfort for drivers and passengers. HELP!! What’s my chance of getting there without roasting in my car? If your car’s air conditioner suddenly stops working, it can be incredibly inconvenient. 5. Where did 40% of the refrigerant go? They can fix it. 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). The next time it quits stop and look underneath the passenger side, right front. While traveling highway as well, car will losing AC for no apparent reason. 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. Powered by Discourse, best viewed with JavaScript enabled. Clogged Air Filter. A defective condenser fan. 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. 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). A condenser has coils and a fan to push the air through the coils and thus cool the refrigerant. I have replaced the heater/AC control, but problem persists. This will thaw the evaporator and allow the AC to work again. 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. 11 Answers. The fix is to simply replace the bad switch, which is usually pretty easy once you’ve done the work of gaining access to it in the first place. Holes in it offers comfort for drivers and passengers and press the button to turn on the highway though,. Air gets warm of 55 mph AC works fine to and from work ( 25 min drive.! 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