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.

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

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: All lights flicker when I am driving or idling but not all the time.

Usually when this occurs, it's caused by an electrical short, corroded ground wire or damaged electrical relay that supplies power to the headlights and other accessory lights. I would recommend having a professional mobile mechanic come to your location and...

Q: How do I change drivers side engine mount on a 2004 expedition xlt 4.6 4wd?

Hi there. This article will give you some basic steps for completing this task. However, if you have never attempted this repair before, I would strongly recommend either purchasing a service and repair manual for your 2004 Ford Expedition; which...

Q: Why does my #1 spark plug continue to burn up in my 2008 Ford F-150

Hello. If you continue to have the spark plug end burn up on just that cylinder then there is an issue with the mixture in that cylinder. It can be caused by a compression problem, carbon build up, or it...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.