There can be two possible reasons why your A/C is only blowing cold air at high speeds. One is that your condenser fan(s) is either not working, or is worn out to the point that it can’t spin sufficiently fast to bring enough air through the condenser. It is easy enough to check to see if the fans are working or not.
Why does my car AC only get cold when I accelerate?
A Failing Expansion Valve
If your A/C flip-flops from hot to cold and back again, your expansion valve could be failing. … If the valve is blocked, the refrigerant flow could be restricted or could be too unrestricted. A slight restriction of refrigerant flow can cause that mechanical part/hardware to get very cold.
Why does my car AC only work when I drive fast?
You could have a low system freon, When the engine is turning faster, the compressor can build up the pressure enough to have cool air out the vents. Or you might not have condenser fans working correctly not pulling cool ari across the condenser while slow or parked.
Why does my AC stop blowing cold when idle?
Overheated engine. Another common reason for car air conditioner not blowing cold air when idling is an overheated engine. … When the car is already overheated and the fans in the radiator and condenser are not working properly for some reason, the system can’t cool down the heat with the maximum efficiency.
How do I fix my car AC not blowing cold air?
The most common cause of a vehicle’s air conditioner not getting cold enough is that it needs to be recharged. You can recharge your refrigerant by yourself, but to save time and make sure the job is done correctly you should make an appointment with your local professional auto shop.
How do I know if my car AC fuse is blown?
Test the load: If you saw a voltage reading during the previous step, run the same test on the “load” side of the fuses. You should again see a reading between 220 and 240. If you see a voltage reading on the “line” side but not the “load” side, it means you have a blown fuse.
Why does my car AC not cool at high speeds?
The A/C thermal expansion valve (TXV) most likely is the cause of the A/C system freezing up at higher engine or vehicle speeds. … The A/C system should be performance tested and checked for pressures to make sure the system has enough refrigerant or the TXV is the cause of the problems.
How do I know if my car AC compressor is bad?
What Are the Signs and Symptoms of a Bad A/C Compressor?
- A Lack of Hot Air Being Released Outside. …
- Loud or Strange Noises From the Unit. …
- Failure of the Compressor to Turn On. …
- Circuit Breaker Tripping. …
- Leaks Around the Air Conditioning Unit. …
- Warm Air Instead of Cool Air Being Delivered to the House. …
- Reduced Airflow.
Why does my AC get warm when I stop?
Your AC system is low on refrigerant. Since the AC compressor is driven by the engine, it doesn’t pump as much refrigerant when you’re at a stop or driving slowly. If the system is low on refrigerant, it will show up as AC blows warm at idle and blows colder when the engine is running at higher RPMs.
Why is my AC not blowing out cold air?
If your central AC is not blowing cold air, the refrigerant may be the problem. The unit could be running low and need additional refrigerant added. The most likely cause of this is a leak. A leak not only keeps the AC unit from cooling properly, but also it can cause other issues within the home.
Can AutoZone check my AC?
If you want to find the right AC solution for your car, you can either shop online or go to your local AutoZone. You can get your car’s parts tested for free at AutoZone.
What makes car AC colder?
The heart of any air conditioning system is a compressor whose job it is to compress the freon. When the freon later expands, it gets very cold. Air blown across metal filled with cold freon causes the air to cool quickly.