Q: Ac compressor turning on and off

asked by on

My truck was blowing cold air and all of a sudden it would blow only cool and then get back to cold and then sometimes it would blow hot but then the next day it would be cold again. And you can hear the Ac compressor kicking on and off back and forth. I tied adding refrigerant. And I add the correct amount cause it was in the green section and it still cuts on and off

My car has 175000 miles.
My car has an automatic transmission.

Hello. If the compressor is turning on and off fairly quickly then that means that there is still a pressure issue. It can be caused by low refrigerant or high pressure. It can also be caused by a bad A/C pressure switch. Any of these will cause this to occur.

I usually install a set of pressure gauges that will read the high and the low side. If the system is low I add more refrigerant. If the high pressure side it too high then I check and see if the fan is working as it should. If the pressures are fine then there is a pressure switch issue within the system.

If you want to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the issue with your A/C and help you fix it accordingly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Ac compressor turning on and off

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 shift out of park

It is quite possible that your shift lock solenoid may have failed. This solenoid prevents the shifter from being moved without the brake pedal depressed. Often times you can hear a slight click noise from under your shift lever when...

Q: Air conditioning not working well

A very common culprit for low A/C temperature is a part called a cabin air filter. I have seen many cases where responsible car owners did not even know that it existed. If the A/C system seems to be operating...

Q: Lighting bolt type light comes on when trying to start vehicle..but doesn't want to start...can't here the fuel pump kick in

A lighning bolt on the dash indicates that the electronic throttle control has an issue. It certainly can cause the vehicle to start and run rough or not at all, depending on the exact fault. You will need to scan...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.