Skip the auto shop - Our mechanics make house calls

Q: The heater is hot as long as you keep the blower on low, but gets cold when you turn it up

asked by on

My heater works good with the heat on low but once I turn it up turn the blower up on it gets cold

My car has 187000 miles.
My car has an automatic transmission.

A: Hi there. The issue you're describing i...

Hi there. The issue you're describing is typically caused by a heater blower motor resister that is malfunctioning or the heater core that might be obstructed with debris. In both cases, removing the dashboard to inspect and diagnose the precise source of your heating system issue will need to be completed. There are other possible components that may be faulty including a heater control valve or temperature sensor that can be checked out during an inspection of the heating system.

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・Save up to 30%

Get a quote

What others are asking

Q: Heat and air

Hello. If the temperature is not changing at all then most of the time this is caused by an issue with the blend door motor. If this has failed then the temperature door will be stuck in one position. I...

Q: My car's ABS light came on and now the transmission won't shift out of first gear

As you know, your vehicle is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU....

Q: What Sensors in the Air Conditioning Tell the Car if the System Is Working or Not?

Modern automotive air conditioning systems come in two basic types: Manually-controlled AC systems Auto AC systems The manual AC systems require the driver to adjust the desired amount of cooling by changing the fan speed...

Related articles

P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.
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.