Question about 2003 GMC Envoy Xl

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Blower motor continues to run when vehicle is off

Need to find the location of the blower motor control module for a 2003 Denali

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Your problem is the Relay which is encased inside the Heater/AC Resistor Module. This is a very common problem with GMC and Chevy Trucks. The Relay's return spring fails and the relay is held closed by gravity. The only fix is to replace the Resistor Module. I have a 2004 Silverado and have replaced the Module 3 times and the Blower Motor twice. The Orange wire feeding the Module is always Hot (12V) and feeds the Relay Contact for Highest Blower Speed. Hence the Blower runs all the time even with the Key off and removed.

Posted on Oct 21, 2009

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It is located on the outside of the air ducting just off from the blower motor. Hope that helps.

Posted on Oct 14, 2009

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