The next time it quits stop and look underneath the passenger side, right front. Your evaporator might be freezing up. 2013 Hyundai Sante Fe Sport. To know more, keep on reading. https://www.wikihow.com/Diagnose-a-Non-Working-Air-Conditioning-in-a-Car 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. https://www.wiseautotools.com/BRASS-DUAL-MANIFOLD-GAUGE-SET/ First thing needed to check an AC system is a gauge set! Hi, the A/C stops blowing cold air when driving on the highway at 75 or more MPH, which is about 3,000 RPM. I was hoping that it was low on refrigerant, which they did not check, and my son thinking that a fan belt gets loose when the car warms up. Sounds like you could be low on refrigerant. Fix car AC Fix car AC that’s blowing warm air. James. The mechanic should perform a diagnostic, fill your leaking AC with coolant, pressurize it and look for the leak. My 2002 Mazda 626 A/C stops working in hot weather (I’m in Atlanta) at random times. Your vehicle’s AC system consists of a compressor, condenser, evaporator, expansion valve, a series of tubes and several fans/blowers. Joseph_E_Meehan July 5, 2016, 9:45pm #3 If it turns hot as soon as you stop, then it is a vacuum problem. I am in Texas and it’s already close to 100 degrees I need HELP!!! I work out of my car, and am driving in the city for about 4 hours a day. I didn't have the time to deal with it then and thought it was the compressor. 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. The average cost for an AC compressor replacement is between $500 and $700 depending on the particular car. There are a few reasons your AC system might stop working and the central part of it is the AC Compressor. Answer: The A/C and engine coolant systems are linked by the radiator and condensor which both sit … I just had my mechanic looking at it and sure enough we were standing there, compressor was coming on and off like it should and then just stopped. My AC stops working after using it for approximately 15 minutes. 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. A/C quits working when engine is under load. MotorWeek's Pat Goss (RockAuto.com is a MotorWeek Sponsor) suggests easy parts to check first when a car's AC system is not as cold as it should be. I then wait approx. Hahaha. Then No cool air. One dealership's service adviser flippantly suggested I should take it in when it happens even though she was well aware that no Nissan dealerships on the Turnpike that I take to my parents house when the air stops working. Is this a case of needing to reload the AC with the refrigerant? AC stops blowing from vents after driving at highway speeds (apparently evaporator coil freezing up) for 30+ minutes (80ish MPH). My 2002 Mazda 626 A/C stops working in hot weather (I’m in Atlanta) at random times. If you over charge most compressors will turn off if it notices the pressure is above a certain limit. An hour later and 70 miles down the road , it works again. Your AC unit should be for the most part maintenance free unless you get a leak, then you’ll need to repair it and recharge your system. Here's What to Check. When the car is moving, versus stopped, there is more air flow over the condenser (the heat exchanger in front of the radiator) and that airflow is essential to system operation. If that were happening, could that freezing stop enough air from coming through as well? If either one of these components fails to do their job, it may result an entire system failure. Issues start when i drive within city limits, and especially when i hit a traffic light or have to wait in drive thru for about 5min. Don 5. is freezing. Works fine around town. Troubleshoot these common car air conditioning system problems. My car has an automatic transmission. Mark helpful. While the AC and cooling system are mechanically independent, that doesn't necessarily … However, after taking an hour and a half trip on the highway (averaging probably 80 MPH) a few months ago, I noticed the air conditioning slowly stopped working- 30 minutes in I had to go up to 3 bars for the equivalent of 1, an hour in, I have to crank the AC all the way up, and it barely pushes out as much as it normally does on one bar. 95 toyota tercel, AC works great on highway at about 55mhp or higher speeds. When the evap coil ices over it will restrict air flow through the evap and cause the air to feel warmer because the ice build up is insulating the coi,l not allowing the heat to be removed from the air passing over the coil. Typically this occurs due to a bad vacuum check valve under the hood. Number One: FreonThere is little to no freon in the AC system. Blowing cold today but warm tomorrow? If I slow down to about 65 MPH it starts to blow cold again. But A/C is more than just comfort; it’s a safety issue too. CarTalk.com Blogs Car Info Our Show Mechanics Files. Posted by mary r alvarez on Jul 12, 2017. Then as your car comes into cruise the AC will come back on. My mechanic recently informed me that my car air conditioner compressor was faulty, and it was subsequently replaced. If water is streaming out the evap. I have not any problems with it until recently. 15 people found this helpful. Content. I put a DIY gauge on there and it was in the red and pressurized (the air is cold while it works too). The fan still blows at the same speed, but the air gets warm. And don’t forget a dirty evaporator coil or dirty (HVAC) air filter. Of course, I'm also impatient, so I probably tried every setting for 10 seconds. This check valve keeps this from occurring. To … my fan speed module which sits under the glove box gave in and i only had 3 and 4 work properly. You should see a water condensation drip. The AC in my car SUDDENLY stopped working today. On three different occasions, the AC randomly stops working. Hello, I have a 2006 Jetta TDI with about 140,000 miles, and a very peculiar problem- My air conditioning stops working on long highway trips. I have a 02 Volvo s80. To make it easier to record the information, download our air conditioning diagnostic sheet; this will guide you through the process. Video footage on how to get your car or truck AC compressor to stop turning on and off. AC works at low speed, then stops cooling at higher speed ... 2011 S40 T5 AC quits cooling at highway speeds. The fan in your car stopped working except when set to the highest setting. I can't remember for sure, but when this happens, it may get warmer as well, but it's hard to tell when almost no air is blowing. https://www.wikihow.com/Diagnose-a-Non-Working-Air-Conditioning-in-a-Car The engine temp is fine, and both radiator fans were still running. A quick pressure check on the low side while running will give you a clue (test when the ambient temp is lowest during the day). If not, turn off the A/C, turn on the heat, and recheck again in a couple of minutes. Powered by Discourse, best viewed with JavaScript enabled. This is truly an annoying situation. When i sit in traffic or sometime when i drive the gauge reaches almost to over heat and the A/C stops working, could that be because i am low of coolant? AC stops working and starts working. I don't specifically recall turning the compressor off, but I think I tried that. Had the same problem 4 mths. Start your car, open the hood and find the engine fan, it will be in the middle of the radiator inside the engine bay, turn on the a/c, does the fan come on? Any suggestions? mercury. Outside temperature was 85°. The last month while driving and after approx. The AC used to blow cold when we start the car. Since 40% of the charge leaked out, there must be a leak somewhere. It was caused by a badly designed sensor that was supposed to prevent the freezing of the evaporator coils. The engine turns the compressor. Part 2 of 3: Checking outside the car and under the hood When it gets hot outside it also causes the pressure to rise which can cause this issue. Does it fail on the highway or in stop-and-go traffic? We use cookies to give you the best possible experience on our website. Jeremy Laukkonen is tech writer and the creator of a popular blog and video game startup. Sometimes there can be worn or unmodified AC systems that function for years without a problem. Because AC is parasitic to engine horsepower output and your engine will distributes that horsepower to the more vital roles such as accelleration so when you are passing you will have all the horsepower your engine can give you. It sounds like you might have a broken fan, or a short circuit in an electrical connection that is affected by motion (or lack of it) or airflow. I have a 07 nissan frontier with 80,000 miles and the a/c runs cold until stopped at a light or in traffic where it blows hot air. Step 1: If the air temperature does not cool when the AC system has engaged there is a good chance that there was an AC compressor failure. No? With proper working cooling system this is no problem. But the weird thing is, if I remember correctly, no matter what setting I changed it to, it would never push as much air out as it should. But now my air conditioner stops cooling whenever the car is on idle or at a stop in front of the traffic light and cools effectively when on the high way or free way and the car is fully in motion? You can park your car in your driveway or on some concrete and leave it to stand overnight. The AC on my 99 Wrangler runs cold for about 20 minutes and then just blows warm air. Temp on engine was normal. Pretty normal for a 9 year old car with 140,000 miles. But if your car heater starts blowing cold air and suddenly stops working in the middle of winter, it can make it downright miserable. My car has 120000 miles. However, once out of highway speeds and in city drive it stops working. The compressor is often the best place to start when trying to resolve an AC problem. Turned off AC when got to bad traffic, back on 5 minutes later and blowing cold again for about5 mins, then off again. Lights Out, Radio Dead and Engine Shut Off? We have given the perfect solution to this problem in our article. ago and the repair shop changed the line (which was supposedly leaking) and recharged system. lupaofpack. Also, when I stop at a light, the AC blows warm air. July 4, 2016, 9:08pm #1. All this time, my AC works perfectly fine, and even in Florida heat, sometimes going above one bar makes it too cold for me. I work out of my car, and am driving in the city for about 4 hours a day. At a standstill the car cools well. A blower issue leaking ) and noticed about half way there that wasn... Car overheats when AC is not working having to cut AC on my 2009 Forester ( 58,000 ). Road, it does lose much of its capacity tldr: AC not working, it stops.. Is charged 4 work properly will make more experts see the question and we will remind when! 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Use a blacklight to find if your AC system might stop working when hot outside also.