Q: Q: Heater blows cold air

asked by on

My car’s heater does not blow out hot air. I have flushed the heater core and checked both ends of the radiator, and the hoses get hot. If I turn off the air and let it sit for a few minutes then turn it back on I get hot air the first couple of seconds. But then it gets cold. Do you know what might be causing this and how I can fix it?

Hello. The Heater/AC control panel utilizes vacuum (from the engine) to actuate the hot water control valve - regulating heat from the heater. A vacuum leak, bad hot water control valve, or the heater control panel itself may have failed. If you would like to have this inspected, a certified professional from YourMechanic can come to your car’s location to have the AC system diagnosed.

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. Q: Heater blows cold air

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: Gas tank will not fill up

This is most likely a problem related to what is called an evaporation canister in the fuel tank which is responsible for venting the tank as you fill it up with fuel. When this is clogged or not working properly,...

Q: Fluid leaking - 2009 Chevrolet Malibu

There should not be ANY leaks or seepage. One obvious thing to check is the drain plug/gasket (if equipped). It is also possible that fluid is leaking past the transmission oil pan gasket if the pan was removed and a...

Q: severe rattling on right side of engine, near alternator

The engine crankshaft pulley is broken most likely. This car had a recall or technical bulletin years ago on replacing this pulley. It may look okay until you run the engine and it will wobble or not turn any accessories...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.