Skip the auto shop - Our mechanics make house calls

Q: heater not hot.

asked by on

The blend door is fine and there is good flow as far as we can tell. We circulated air through each line with the engine intake clamped off and fluid flowed. Still no heat. You can see the heater coil lines swell a little with pressure but they do not get hot.
My car has an automatic transmission.

A: Hi there. Assuming, the temperature blend d...

Hi there. Assuming, the temperature blend door is properly functioning, would lead me to believe the heater core is restricted or air is trapped and a cooling system flush could resolve the issue. The heater control valve and/or vacuum control to the valve may be at fault. Proper diagnoses should be performed to avoid unnecessary repairs. I recommend having your vehicle’s heater is not hot be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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: Key gets stuck in ignition

Yes it sounds like you are having an issue with your lock cylinder. Some lock cylinders and keys are tied to the theft deterrent system in the vehicle, so after installation it might be necessary to have the lock reprogrammed...

Q: Truck shudders when turning corners.

When turning and the vehicle shudders, check the tires to see if they are coming in contact with the frame. If they are, then the steering stop is loose and has backed off causing the steering to steer at a...

Q: Emergency brake light won't stay on. If really cold in the morning, it's out until I drive for about a mile or so

Hi there. Check the cables to the parking brake when you set the parking brake. There is a parking brake sensor attached to the pedal and if the sensor is tripped, the indicator brake light will come on the dash....

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.