Skip the auto shop - Our mechanics make house calls

Q: My air is blowing cold-hot-cold-hot-cold-hot...

asked by on

My air was not blowing as cold as it used to, so we put some coolant in. After that, it blew colder for about 2 hours and then it started blowing hot. Then it blew cool again, and then hot. It mostly blows warm air now, as if it does not work, but once in a while, it will blow cold air for about 5 seconds.

My car has 68000 miles.
My car has an automatic transmission.

It is possible that you have a leak in the AC system. There are pressure switches that will turn off the compressor if the pressure is too high or too low. The low refrigerant level could cause the AC compressor to cycle on and off. If you would like to have this done, a certified technician from YourMechanic can come to your car’s location to diagnose the AC system and make the correct repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. My air is blowing cold-hot-cold-hot-cold-hot...

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: Canister purge valve issue. What will happen if I don't fix it right away?

Hey there. The main issue with not repairing the EVAP system is that of passing an emissions test as required in most states. Anytime this system is not working properly, your car will not pass an emissions test. The...

Q: new ac compressor now not energizing clutch

Hello. From what you describe, it sounds like there may be some sort of issue with the clutch pressure / cycling switch. These switches are responsible for activating the compressor when they detect that the pressure is at or temperature...

Q: Transmission

You may be experiencing what's called "Limp Mode." Your Jeep trans staying in 2nd or 3rd and not shifting probably means that it is in limp mode. It is a computer strategy designed to protect the transmission from harm when...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...