Question about 2003 GMC Envoy

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Blower motor will not turn off even with relay pulled.

1998 GMC Safari
Blower motor will not shut off even with engine off and relay pulled.
Disconnected line to blower and it turns off, reconnect line and blower turn on again with engine off.

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Replace the blower motor speed control module, it is shorted.

Posted on Jun 21, 2009


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Related Questions:

1 Answer

GMC 2004 Envoy blows heat even with blower off ... Why ?

The relay in your blower motor is stuck on, there is a TSB for this issue. Replace the blower motor resistor and you'll be back in business.
How does the resistor get power if the fuse is pulled?
Replacing the resistor will cure both problems. TSB is a technical service bullitin seen below
Subject:HVAC Blower Motor May Run Continuously After Vehicle is Turned Off (Replace Blower Resistor Relay)Models:2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT2004 GMC Envoy, Envoy XL, Sierra, Yukon, Yukon XLwith Manual Control HVAC (RPO CJ3)Built Prior to August, 2003

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Where is the blower motor relay

Under the hood on the passenger side near the blower motor.

I’m happy to assist further over the phone at

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You probably have a bad connecting rod bearing, broken piston, worn piston wrist pin, a bad lifter or rocker arm. You could pull the valve covers to see if anything is broken. The others are in the motor.

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this problem is caused by a shorted blower motor speed control modual/resistor, it is located next to the blower motor in the air ducting replace it.

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I had this problem in a s10 blazer, it ended up being a badly corroded ground wire that actually connected to the blower at one of the mounting screws.

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Blower motor problem!

Hope this helps....


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Blower motor in gmc safari will not activate

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