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Category: Pontiac
Satisfied Customers: 9176
Experience:  ASE A1-A8 w/L1 GM master technician.Factory certified/40 years experience
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The vehicle is stationary it only blows cold air..blew..electrical

Resolved Question:

My heater will only blow hot air when the car is moving. when the vehicle is stationary it only blows cold air. my battery blew up this summer and i had to replace it, could this be a related electrical problem?
Submitted: 6 years ago.
Category: Pontiac
Expert:  John replied 6 years ago.


After a battery blowing up any kind of electrical failure is possible,but your problem sounds more like a coolant flow problem.By this I mean that the heater core hose comming from the engine has a restricted flow that does not allow the heater core to get hot at idle.When driving the coolant flow is faster & will over come some obstructions.Sometimes one can pull the heater hoses & flush the heater core to repair this problem.

Customer: replied 6 years ago.
thats great i'll give it a shot. i'm not much of a mechanic but i am on a budget and i would like to give it a try myself, so how do go about that and what do i flush it with? but i should also have mentioned that in conjunction with this problem, the button that switches the air circulation from outside to inside the vehicle is also broken, when i press it the led will flash then immediatly switch back to the outside intake with no change in airflow. is this related? or a seperate electrical malfunction?
Expert:  John replied 6 years ago.
The inside /outside air is a separate electrical malfunction,you should still get heat.I would use some of the radiator flush chemical s from your local parts store,drain a little coolant if necessary put in the flush & go for a good drive down the highway with the heat on.Come back & drain the coolant ,pull one of the heater hoses going into the heater core at the easiest position & use a garden hose to flush it.
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