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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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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