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CarQuestionGuy, Technician
Category: Car
Satisfied Customers: 1259
Experience:  ASE Master Auto Technician for 5 years, ASE Refrigerant Handler, ASA, iATN
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2004 Pontiac Grand Prix: coolant level warms..blowing cold air

Customer Question

2004 Pontiac Grand Prix,coolant level is fine, car warms up, but heater is blowing cold air
Submitted: 8 years ago.
Category: Car
Expert:  CarQuestionGuy replied 8 years ago.
Thanks for using Just Answer

Do you know where your heater hoses are on your engine? If so, are they getting hot?

Have you checked the coolant in the radiator and the reservior both?

Let me know.
Customer: replied 8 years ago.
Heater hoses are getting hot and the coolant level in the rad and tank are ok
Expert:  CarQuestionGuy replied 8 years ago.
OK, this narrows down the possiblities. The most common causes of your problem are:
1) Blend doors not working. This could be because of a vacuum hose problem, linkage problem or even a heater switch control problem.
2) Heater control electrical problem. This is the most common problem with symptoms like these. If the heater controls are not working right they might not be sending the signal to open the blend doors to let the heat get blown into the car.

You might have already done it but you should look under your dash to see if you can see any linkage that is disconnected. You should also try moving the temperature controls to see if you can hear anything moving under your dash.

Let me know if you need anything else.