Q: My vehicle occasionally heats up and blows cold air out of the heater vents.

asked by on

I had the headgaskets done on my Durango not to long ago and it did good for a little while and then I noticed it starting to get warm again. Then noticed cold air blowing out of the heater vents. This doesn't happen every time I drive it. When I'm driving down the road it seems fine but when it's idling it starts to blow cold air out of the vents and tends to heat up. But like I said it doesn't do it every time so I'm not sure what it is. The coolant level seems to be up and the fan is working so only thing I can think of is water pump.

My car has 138000 miles.
My car has an automatic transmission.

If you are getting the heater to work sometimes and other times not then it is due to the engine cooling system has air in it. You should have the cooling system purged of air and then retest system. As long as the engine is full and good flow of coolant through the heater core then you will have heat.

Was this answer helpful?

Hi there. It’s quite possible that your heater issue is caused by an obstruction in your heater core. In fact, that may have been a significant reason your Durango overheated and required the head gasket to be replaced. The heater is ’powered’ by recycled coolant that circulates through the heater core. When this flow of coolant is restricted, the engine will overheat, but it also causes the heater to not function correctly. I would recommend highly that you have a professional mobile mechanic come to your location and complete a heater is not working inspection, to determine if this is the source of your problems. If so, it could save you thousands of dollars on having additional damage occur to your Durango’s motor.

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. My vehicle occasionally heats up and blows cold air out of the heater vents.

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: Vehicle shifting by itself

Hello. If your truck is shifting on its own, that is a serious issue that needs immediate attention. There can be several causes for this including bad transmission fluid or loose shifter linkages. A certified technician, like one from YourMechanic,...

Q: I got a 2004 Isuzu Rodeo V6 3.5 L I got it it came on on the dash what is that

You will need to have the computer scanned to get the stored codes so you can isolate the cause of system going to reduced power. This can be caused by several different causes and need the test to find the...

Q: Turns over won't fire, throws low voltage oil pressure sensor. Replaced sensor still won't fire.

Hi there. It's very possible that the source of your non-starting problem is not related to the oil pressure sensor. In most cases, when this occurs, it's caused by a faulty crankshaft position sensor or other ignition timing component. It...

Related articles

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...
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...
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.