Skip the auto shop - Our mechanics make house calls

Q: AC still blowing hot air

asked by on

Replaced the motor blower resister and the motor blower and recharged the AC but it is still not blowing out cold air and when the AC is on it makes my RPM gauge jump up and down. Please help

My car has 122000 miles.
My car has an automatic transmission.

Is there any air blowing out from the vents at all? If so, then the blower is working. If not, there could be a problem with the power supply for the blower motor, and that will need to be diagnosed. If the problem is that the air blowing out is’t cold, then you will need to have the A/C pressures checked while the A/C is running. First though check that the compressor is running, and that the fans are turning on as well. If the compressor is running, and the fans are coming on, the pressures may not be correct, which will cause the A/C not to get cold. This A/C problem will need the help of a qualified professional, such as one from YourMechanic.

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!

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 start. Tries to turn over and the dies immediately

Hi There, A few different things will usually cause the car to start and then die. A bad ignition coil can cause this if it is beginning to fail, resulting in intermittent starting problems. A dirty or faulty mass air...

Q: My car battery dead and the key is stuck in the ignition stuck on on and tried to jump it and it didn't work what do I do now

The fault with the battery should be resolved first. Once power is restored, the key will come out. There is an override function to remove the key (see vehicle owner's manual) but the underlying issue is your battery is dead....

Q: Hi I had a friend replace my motor mounts on my 2004 Pacifica v-6. Apparently getting them in and out were difficult.

Hi there. The leaks from the transmission could have came from the oil pan. When using a jack to lift up the engine, if the jack was sitting on the transmission oil pan, it probably cracked the pan, or the...

Related articles

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...