Q: Engine gets hot, heater blows cold air

asked by on

The engine gets hot after running in town or on the highway, but the heater will blow cold air. Then the engine temperature will drop and the heater warms up, but only for a few minutes. Is it a water pump issue or just needs a new thermostat?

My car has 212000 miles.
My car has an automatic transmission.

Hi Ray. Thanks for contacting us today. When the engine gets hot and the heater blows cold air, it’s usually caused by either an obstruction of debris inside the heater core. When a water pump or thermostat does not work, it will typically cause overheating rather quickly - so it’s possible that you have a bunch of sludge collecting in the heater core. I think flushing your coolant system is probably the best way to start. If this does not resolve your issue, it’s smart to have a professional mechanic come to your location and complete an onsite inspection.

Was this answer helpful?
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. Engine gets hot, 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: Coolant leak in a 2002 Cadillac Escalade

The most common coolant leak other owners have had is the water pump leaking. The typical repair is water pump and thermostat replacement. I recommend having a mechanic, such as one from YourMechanic, inspect your coolant leak, which may involve...

Q: I have a 2007 Chevy Impala...battery saver active mode

Hi There, This can be caused by a loose battery cable which is often times the problem. Try checking to be sure they are connected properly. Also, there is a sensor that has 3 small wires running to it that...

Q: Traction warning on, unexpected deceleration

It definitely sounds like there is an issue either with the engine management or traction control system. Fault codes need to be read out to see if there are any underlying issues causing these malfunctions. One common input to both...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.