Heater blower stopped working - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 05-05-2011, 04:16 PM
Lorgeo Lorgeo is offline
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2002 Chevy TrailBlazer LT
Majestic Red Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: Shelton, CT
Posts: 7
Heater blower stopped working

Hello All,
I have a 2002 Trailblazer LT w/ 75,000 miles, Majestic Red Metallic. Turned on the heat today, switched on the blower and it ran for about 4 seconds and stopped. It doesn't work on any speed. I checked the fuse and its OK. Any ideas what else it might be other than something major?
Thanks,
Lorgeo
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  #2  
Old 05-05-2011, 04:26 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
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There are two fuses, but it's almost always a blower resistor pack or the connector on the wiring harness going to it. Assume you have the 5-speed manual control, so the resistor pack is usually under $30. If not, it's a more expensive electronic module, but still under $100. Even if it's the blower motor, and you should drag out your meter to confirm that, it's not like you have to replace the entire control head that could be real money.

Start reading here:

http://forums.trailvoy.com/showthread.php?t=32751
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  #3  
Old 05-05-2011, 06:58 PM
Lorgeo Lorgeo is offline
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2002 Chevy TrailBlazer LT
Majestic Red Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: Shelton, CT
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Thanks Roadie! I did a bit more researching on the site and found a good how- to with pics on replacing the module. I suppose I'll go that route and order one. (I do have the manual 5 spd manual control. The only thing I'm wondering is it seems that prior to the module going in the other posts, the switch (in the other posts) worked in at least 1 of the speeds, prior to going bad. Mine just quit. Did check both fuses, one in the engine compartment and one under the rear seat. Thanks again....I'll update with results.
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  #4  
Old 05-11-2011, 10:27 PM
elton077 elton077 is offline
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2003 Olds Bravada
Summit White 4.2L I6 AWD
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Quote:
Originally Posted by Lorgeo View Post
Thanks Roadie! I did a bit more researching on the site and found a good how- to with pics on replacing the module. I suppose I'll go that route and order one. (I do have the manual 5 spd manual control. The only thing I'm wondering is it seems that prior to the module going in the other posts, the switch (in the other posts) worked in at least 1 of the speeds, prior to going bad. Mine just quit. Did check both fuses, one in the engine compartment and one under the rear seat. Thanks again....I'll update with results.
Trust the roadie.

Speaking from quite recent experience, it seems that almost any HVAC fault can somewhat usually be attributed to the resistor pack (or module as in my auto-controlled HVAC case) on the GMT 360s. Many users report sporadic fan function or, as in my '05 Envoy's case, complete failure at all fan speeds.
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  #5  
Old 05-17-2011, 01:24 AM
jbbetoney jbbetoney is offline
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2006 Chevy TrailBlazer LS
Dark Green Metallic 4.2L I6 4X4
Join Date: Apr 2011
Location: Winslow, Az
Posts: 1
Blower Motor suggestion

I hope this'll help. I had the same problem as Roadie described. I will guess our problems occured when we placed the fan switch to Position 5. The cable harness connector to my resistor module burnt up at the RED and BLACK wires (pins E and G). My fan didn't work in any positions. After I replaced the blower motor, resistor module, and harness connector (had to crimp wires), I also replaced the 40 amp fuse, located underhood, with a 30 amp fuse. No problems yet. Total cost was less than $120. Hopefully, the $2.50 30-amp fuse will blow before it causes a $100+ problem. I would suggest to everyone replacing the 40 amp fuse with a 30 amp.
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  #6  
Old 05-30-2011, 09:11 AM
Lorgeo Lorgeo is offline
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2002 Chevy TrailBlazer LT
Majestic Red Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: Shelton, CT
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Update on the blower problem

Quote:
Originally Posted by Lorgeo View Post
Thanks Roadie! I did a bit more researching on the site and found a good how- to with pics on replacing the module. I suppose I'll go that route and order one. (I do have the manual 5 spd manual control. The only thing I'm wondering is it seems that prior to the module going in the other posts, the switch (in the other posts) worked in at least 1 of the speeds, prior to going bad. Mine just quit. Did check both fuses, one in the engine compartment and one under the rear seat. Thanks again....I'll update with results.
Hi All,
Funny thing, a week or two after my last post I absent-mindedly turned the heat on early one chilly morning and suddenly realized the blower had come back to life!! Have since used the air conditioning as well and the blower seems ok........ I hate when things fix themselves as they tend to die at the worst possible time, but for now I'll just leave well-enought alone. At least now I know what to do when the time comes! Thanks everyone!!
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  #7  
Old 05-30-2011, 09:37 PM
pejeeper pejeeper is offline
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2005 Chevy TrailBlazer LS
Silverstone Metallic 4.2L I6 4X4
Join Date: Jul 2010
Location: Dutchess Cty, NY
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When you pull the resistor wiring harness and resistor pack and find a terminal or 2 melted, you need to replace your blower motor. As the blower motor ages, it draws more current, thus melting out the components. I'm replacing the resistor pack and harness for the 2nd time in 6 months, along with the blower motor for the first time.
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  #8  
Old 07-17-2011, 10:25 PM
LowSlow O FO's Avatar
LowSlow O FO LowSlow O FO is offline
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2004 Chevy TrailBlazer LS
Indigo Blue Metallic 4.2L I6 4X4
Join Date: Jun 2011
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Just want to say thanks to you guys that spend the time to make my life easier. My resistor is on the way.
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  #9  
Old 01-27-2014, 09:10 PM
schrader327 schrader327 is offline
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2006 Chevy TrailBlazer LS
Silverstone Metallic 4.2L I6 4X4
Join Date: Jan 2014
Location: orefield pa
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heat

I have a 2006 trailblazer. Heat was working went to sons basketball game shut car off left heat control knob on 2. Came out from game hour later started car no heat. Checked fuse looks good, tested blower motor works, replaced resistor with new one still no heat? Is it the heat control panel that's bad?
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