Skip the auto shop - Our mechanics make house calls

Q: Heater blowing cold

asked by on

My heater is not blowing hot air, A/C works fine. (Water pump was already replaced previously due to a separate issue). Car is not overheating I've pulled the heater hoses off and flushed the heater core/replaced hoses. I'm thinking it's the air blend actuator could this be the possible issue or something else?

My car has 140000 miles.

A: If the vehicle is neither overheating or ru...

If the vehicle is neither overheating or running too cool / taking too long to reach operating temperature, the thermostat is most likely opening and closing properly. Be certain the coolant is at the proper level and both hoses to the heater core are warm. If the heater core was flushed and flowing properly, then there can be a problem with the heater controls not signaling the blend actuator to open, or possibly a broken or detached blend door mechanism.

A certified technician can inspect the heating system and locate the exact cause for you.

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

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: My check engine engine light is on and the computer (ECM) said it's a crank sensor problem.

Check the crankshaft position sensor and see if there is a loose wire or if the remote wiring is disabling the sensor. If the wiring is good and the sensor is hooked up properly, then I recommend replacing the crankshaft...

Q: How can I tell if the water pump has been replaced as the previous owner claimed?

Hi, thanks for your question. The best thing to get when purchasing a car are service records. If the seller doesn't have them in hand, you can go to the shop that did the work and they will have records...

Q: Car wont start

Hi there. There are multiple potential issues that cause a vehicle to not crank over or fail to start. This could be a battery-related issue if the battery has low cranking amps, or a starter or starter relay issue not...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...