Q: Q: My AC

asked by on

When I first start my car and turn on my ac it always immediately blows cold til about 15 to 20 mins after, it'll just start blowing regular air, it'll stop blowing cold. When I cut the car off for a while and start it back up it blows cold again until about 15 mins so I'm not sure what the issue is but it's starting to get really hot here in Houston so this has to be fixed asap. Please help. BIG THANKS!!!

My car has 148000 miles.
My car has an automatic transmission.

The evaporator is freezing up due to over-cooling. There is a thermistor on the evaporator (behind the glove box) whose function is to prevent the surface of the evaporator from getting below 32F and icing up. It should be cycling the compressor off, but your’s doesn’t. When the evaporator ices over, the A/C gets warm. After the ice melts, it blows cold again until it ices again.

You need the evaporator thermistor tested and probably replaced. If you need help with this, consider getting some assistance from a qualified mechanic who can diagnose your A/C issue and replace your thermistor if necessary.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car won't turn over but has new battery

YourMechanic next door was most likely correct and you have a problem with the key anti-theft system disabling the vehicle. You will either have to have a specialized locksmith come to you, program the key and make new ones, or...

Q: Car is still overheating - 2006 Acura TL

There is no bleed screw on the 2nd generation TLs. Bleed the cooling system with the nose of the car higher than the rear if possible let it heat up at an idle until the thermostat opens and allow all...

Q: is this car a good car?

You should have a mobile mechanic like one from YourMechanic do a pre-purchase inspection of the vehicle so you can make a better informed decision on the purchase of this vehicle or any other vehicles you are considering on purchasing....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...