The air blower won't shut off even when I turn off the ignition. It just keeps blowing air. I had to take out the fuse in order to turn it off. when I put back the fuse it starts again even if the car is shut off. Help!
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There is a short circuit on the B+ power circuit for the blower motor ! Your best bet would be to take your vehicle to a qualified repair shop ! Finding electrical shorts can be tough ,even for seasoned tech > There are videos on youtube on finding short circuits an basic electrical trouble shooting , how to read a wiring diagram ! You can find a wiring diagram at http://bbbind.com/free_tsb.html . Troubleshoot Car Electrical Problem .
The car normally blows air through the blower however the controls and settings of the speed of the blower are controlled by the blower motor resistor. The resistor controls the speed of the blower fan. If your blower still works on the highest setting then the blower itself is still in working order. If you are not getting any air at all, even on the highest setting, then chances are the blower has gone bad, blown fuse or open wire. If this does not help please give us more information to work with.
If you turn the key off and it wont shut off the heater then there are some interesting things you need to check. The first would be the whole ignition switch. When you shut off the key, the power should stop to that accessory. If that is okay then you need to check the controls for the heater. The issue with no heat is one of a blend door being stuck and this could be the controls again.
I have the same problem. I have also been searching the web for a solution. I came across someone saying that it was the heater module located behind the glove department. I can't find now where i read this but it said the part was approx. $150.00. He was having same problem as us, heater wouldn't obey touch commands to turn on/off or when heater did blow it would only blow real low or real high. Like you, after turning off engine blower motor was still running even though it wasn't blowing air out.
I'm tired of paying for things that are not due to normal "wear and tear" on my 2003 Envoy. Let me know if this helps you and how you repaired it. I'll probably have to take mine to the shop but because I'm a "girl" I swear they think I'm crazy with all my Envoy complaints.