Skip the auto shop - Our mechanics make house calls

Q: A question regarding my car blowing intermittently hot and cold air.

asked by on

My cars air condition intermittently blows hot and cold air. When in gear cold air comes out and if in neutral or parked it blows hot air. I also noticed lately the temperature of the car will go up and down. If in neutral it tends to run hot as with blowing hot air if driving the temperature will go back down in the air will get cool.

My car has 140000 miles.
My car has a manual transmission.

A: It sounds like you have failed cooling fans...

It sounds like you have failed cooling fans. When the car is at idle, the fans should run to pull air across the A/C condenser to regulate refrigerant temperatures and the radiator to regulate coolant temperature. If these fans fail, then these components will receive no airflow at idle, but will still get airflow while driving due to the car moving. I would suggest having a qualified technician, such as one from YourMechanic, inspect your fan operation, as well as the rest of the cooling system for proper operation.

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: Coolant temperature gauge does not move at all. 1998 Ford Ranger

Hi there - most likely the coolant temperature sensor (for the gauge, not the coolant sensor that drives the fuel injection - there are usually two) is toast. This can be checked with an ohm meter. A reading of 2K...

Q: front end vibrates when in park and at stop lights

Hello there, many faults will cause your 2008 Mazda 3 to have a vibration at idle. The most common would be a misfire condition, fuel pump, vacuum leak, oxygen sensor, mass air flow sensor, or a coil. A qualified Technician...

Q: Brake lights don't come off

Check the brake pedal, where it contacts the brake switch, to see if the contact button is intact. These buttons can deteriorate and not contact the brake switch to turn off the lights. If you replace that button the lights...

Related articles

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control 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...
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.