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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 12-27-2008, 09:48 PM
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Question Blower motor resistor or control module?

Ok so I am experiencing some intermittent fan issues with my heater and with pretty constant 0-20 degree weather that is no good. So I was looking around and saw issues with blower motor control modules and blower motor resistors. Can anyone tell me which issue I am having so i can order the right part? I do have the automatic hvac controls and even if I turn on the manual control the fan does not respond but it will come on just not at any certain time. Thanks for the help!

Nate
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  #2  
Old 01-02-2009, 01:41 AM
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Hey I am on the forum looking for a solution to this exact issue. It only started in the cold weather and when we hit a bump in the road.
I will appreciate hearing feedback on this.
Thanks
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  #3  
Old 01-02-2009, 03:59 AM
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Probable Fix For Blower Motor Problem

I had the same intermittent blower motor problem on my 2003 Trailblazer, and I replaced the Blower Motor Control Module and it fixed the problem. I also have the auto HVAC. The blower motor would run for a while even with the ignition off. It would not work in any manual settings. I purchased the Blower Motor Control Module at my local Chevy dealer and paid $90.00. It was easy to replace. I hope this helps!

Dave
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Old 01-02-2009, 11:55 AM
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Hi Dave and thanks for the response. Is the Blower Motor Control Module the actual motor, or the resistor, or another part entirely?
I don't want to purchase the wrong part and not be able to return it because it's an electrical item.
Appreciate it,
Happy New Year!
Here's a link to a pic of what I've been calling the resistor.
http://webcaps.ecomm.gm.com/servlet/...rtnbr=15-80186
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Old 01-02-2009, 01:51 PM
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Hi Jay, the blower control module is installed in the lower area of the heater plenum and it looks just like the picture you provided. The local Chevy dealership first tried to sell me the resistor type module for a manual system which looks different and is a lot cheaper. Have a nice day.

Dave
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Old 01-02-2009, 03:42 PM
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Perfect.
Thanks Dave
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Old 01-02-2009, 08:05 PM
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Always check the wiring harness at the time you replace the resistor or module. The wires have been known to have an issue with breaking and causing much of the same problem as you describe. The dealer may tell you to replace both if you replace the resistor/module as they say the problem can be related.
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Old 01-02-2009, 09:07 PM
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Hey more great advice. To clarify I assume you mean the plug that goes into the module. If its not looking to good and needs to be replaced is it a matter of soldering in the new piece or does it come as a whole length which gets plugged in on both ends?
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Old 01-02-2009, 10:19 PM
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I looked at the plug on my TB and it just seems like it isn't staying tight in the module. I can move it around and turn it on and off. Is that just the module or the plug itself??
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Old 01-12-2009, 10:32 PM
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2003 chevy trailblazer blower control module

where is this located i believe this is my problem. i have automatic setting. My blower will run low no matter what i put it on in manual settings. I can restart the car and sometimes get it to go to high or it will go to high whenever it wants to.
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