BrianZ06 Posted December 8, 2013 Report Share Posted December 8, 2013 The heater/ac fan blower motor runs on high only and it stays running with the van turned off. I have never had one stay running. On my nissan altima I replaced the fan speed resistor because it was doing the same thing but it was not running with the engine off. I am thinking the same part is bad on my van but never seen one that stayed running with the engine turned off. Any ever have one do this ? Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted December 8, 2013 Report Share Posted December 8, 2013 does it continue to run when you unplug the speed resister? Quote Link to comment Share on other sites More sharing options...
BrianZ06 Posted December 8, 2013 Author Report Share Posted December 8, 2013 Have not tried that yet. The van is not at my place right now. Family member has been driving it and I had him unplug the wire on the blower. What will this tell me ? Quote Link to comment Share on other sites More sharing options...
Cordell Posted December 8, 2013 Report Share Posted December 8, 2013 does it continue to run when you unplug the speed resister? It shouldn't run at all, power comes out of the resistor right next to the motor. I'd start by checking the wires to the resistor and make sure voltage moves to each wire when the speed control is switched. Sure seems like the speed switch is shorted in the control head. Quote Link to comment Share on other sites More sharing options...
BrianZ06 Posted December 8, 2013 Author Report Share Posted December 8, 2013 Scott are you familiar with this > Bulletin No.: 11046 Date: April 07, 2011 Subject: 11046 - Special Coverage Adjustment - Heating, Ventilation, and Air Conditioning Blower Not Fully Functional on All Blower Speeds, Inoperative, or Runs Continuously with the Ignition Off Models: 2003-2006 Chevrolet Avalanche, Suburban, Tahoe 2003-2007 ChevroletSilverado 2003-2006 GMC Yukon, Yukon XL 2003-2007 GMC Sierra Equipped with Manual HVAC (CJ3) or Heavy Duty Heater (C42 Condition On some 2003-2006 model year Chevrolet Avalanche, Suburban, Tahoe; GMC Yukon, Yukon XL; and 2003-2007 model year Chevrolet Silverado and GMC Sierra vehicles equipped with a manual heating, ventilation, and air conditioning (HVAC) system (CJ3) or heavy duty heater (C42), the interface between the electrical terminals of the relay resistor module and the wiring connector that powers the module may be incapable of conducting higher current levels for sustained periods of blower motor operation. In addition, moisture and other contaminants may enter the fresh air intake plenum and contact the internal circuit of the module or corrode the terminals. Either of the above may cause the relay resistor module or wiring connector to overheat, resulting in one or more of the following symptoms: - The HVAC blower may not function on certain or all blower speed settings - A burning plastic smell or smoke may be present in the vehicle - The HVAC blower may run continually with the ignition in the OFF position Quote Link to comment Share on other sites More sharing options...
Cordell Posted December 8, 2013 Report Share Posted December 8, 2013 Scott are you familiar with this > Bulletin No.: 11046 Date: April 07, 2011 Subject: 11046 - Special Coverage Adjustment - Heating, Ventilation, and Air Conditioning Blower Not Fully Functional on All Blower Speeds, Inoperative, or Runs Continuously with the Ignition Off Models: 2003-2006 Chevrolet Avalanche, Suburban, Tahoe 2003-2007 ChevroletSilverado 2003-2006 GMC Yukon, Yukon XL 2003-2007 GMC Sierra Equipped with Manual HVAC (CJ3) or Heavy Duty Heater (C42 Condition On some 2003-2006 model year Chevrolet Avalanche, Suburban, Tahoe; GMC Yukon, Yukon XL; and 2003-2007 model year Chevrolet Silverado and GMC Sierra vehicles equipped with a manual heating, ventilation, and air conditioning (HVAC) system (CJ3) or heavy duty heater (C42), the interface between the electrical terminals of the relay resistor module and the wiring connector that powers the module may be incapable of conducting higher current levels for sustained periods of blower motor operation. In addition, moisture and other contaminants may enter the fresh air intake plenum and contact the internal circuit of the module or corrode the terminals. Either of the above may cause the relay resistor module or wiring connector to overheat, resulting in one or more of the following symptoms: - The HVAC blower may not function on certain or all blower speed settings - A burning plastic smell or smoke may be present in the vehicle - The HVAC blower may run continually with the ignition in the OFF position Yeah, and its possible, but it usually doesn't cause it to stay on after the car shuts off. Typically it only stops working on low speeds. The harness and/or resistor is usually melted or burned. Quote Link to comment Share on other sites More sharing options...
BrianZ06 Posted December 8, 2013 Author Report Share Posted December 8, 2013 Ok I will have the van at my house this weekend to check it out more. I am going to assume the resistor is toast. Thanks ! Quote Link to comment Share on other sites More sharing options...
Rocky31186 Posted December 8, 2013 Report Share Posted December 8, 2013 I bet the plug in going to the resistor is melted and hot wire is touching the signal wire. Quote Link to comment Share on other sites More sharing options...
BrianZ06 Posted December 8, 2013 Author Report Share Posted December 8, 2013 Will post what I find. Quote Link to comment Share on other sites More sharing options...
RS69 Posted December 10, 2013 Report Share Posted December 10, 2013 I had to replace the resistor and harness on my 2005 HD. The blower fan stopped working on position 4. The harness was melted. Quote Link to comment Share on other sites More sharing options...
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