Question about 2004 GMC Envoy

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Blower motor wont shut off

2004 envoy, blower motor wont stop even with vehicle turned off. running down battery. any suggestions? thanks

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  • wheelcfa Jan 01, 2009

    thanks dgjtex, will do....Happy New Year to ya

  • bworley2 Jan 20, 2009

    I have the same issue. I've pulled the fuse so it won't wear down the battery. Where is the blower resistor you are talking about.

  • Anonymous Jan 30, 2009

    I have the same problem on my 05 Yukon.

  • Anonymous Feb 26, 2009

    blower motor will not turn off,

  • Anonymous Mar 12, 2014

    To stop have to unhook battery terminal.

  • Anonymous Mar 22, 2014

    I first removed blower that would not come on, and the part beside it. I think its called the module. I tested it and it had power at the plug going to motor. I cleaned all connections reinstalled and it works but will not turn off when vehicle is shut off. It does eventually go off.

  • Anonymous Mar 25, 2014

    blower motor stays on unplug battery

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  • Master
  • 405 Answers

Check your blower resister in duct right in from of motor. These tend to burn out and short every once in a while

Posted on Dec 31, 2008

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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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If it drains your battery dead there are possible issues; 1) a weak battery that needs replacing or 2) a faulty power stage/transistor unit ont he blower fan.

The transistor unit has power and ground and a digital signal from the control unit. When the transistor sticks, the the blower will not stop when the ignition is turned off.

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Yes,it is the blower resister,it controls all the speeds to the blower motor,it is located near the blower motor,and it might have a wire harness that is burned up too,replace it,and the wire harness,and the blower motor,the blower motor is what causes the resister to fail,it draws too many amps,even though it might sound good,and run fine,it is requiring to many amps to run it.If this was at all helpful,please rate,thank you.

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the connector fpr the resister which should be located close to blower motor counld be melted from overheated resister. you should check and replace resister and connector.this should be your fix. thanks and good luck.

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1 Answer

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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.
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