2002 Trailblazer EXT rear A/C fan does not come on - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 08-08-2011, 10:43 PM
toddwallace toddwallace is offline
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2002 Chevy TrailBlazer LT EXT
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2002 Trailblazer EXT rear A/C fan does not come on

I have a 2002 Trailblzer that has sporatic issues with the rear a/c. The control for it is a round knob with R,0,1,2,3.. It stopped coming on when you try to user the knob..then..for some unknown reason comes on when driving down the road. No idea where to start to fix it? Is it the motor or the knob.. Where can I get parts?? Any pointers on replacing??
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  #2  
Old 08-09-2011, 03:08 AM
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TRAILBLAZINFOOL TRAILBLAZINFOOL is offline
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2002 Chevy TrailBlazer LS
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I also have a 2002 with a similar issue. Mine doesn't work at all though. Once you figure out what's wrong with it you can get parts at parts4chevy.com
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Old 08-09-2011, 06:43 AM
toddwallace toddwallace is offline
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Quote:
Originally Posted by TRAILBLAZINFOOL View Post
I also have a 2002 with a similar issue. Mine doesn't work at all though. Once you figure out what's wrong with it you can get parts at parts4chevy.com
I'm leaning towards blower motor..
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Old 08-09-2011, 08:20 AM
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the roadie the roadie is offline
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Almost always the speed control module. I think I've read about 100 members with dead modules, and not one rear blower motor failure. Totally dead ones can be the in-line fuse near the motor. The module can even fail in a way that leaves the blower running with the ignition off and the key out, draining the battery.

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Old 08-09-2011, 08:41 AM
toddwallace toddwallace is offline
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2002 Chevy TrailBlazer LT EXT
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Almost always the speed control module. I think I've read about 100 members with dead modules, and not one rear blower motor failure. Totally dead ones can be the in-line fuse near the motor. The module can even fail in a way that leaves the blower running with the ignition off and the key out, draining the battery.

Not to sound stupid, but where is the motor that controls the rear air located? Don't want to go tearing into stuff to find it...
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Old 08-09-2011, 08:49 AM
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bromanjr bromanjr is offline
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2004 GMC Envoy SLT XUV
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Quote:
Originally Posted by toddwallace View Post
Not to sound stupid, but where is the motor that controls the rear air located? Don't want to go tearing into stuff to find it...
The Blower Motor is shown in the diagram, Item 1. But is rarely the problem.

The usual suspect is the Blower Speed Control Module, Item 5.

There are 2 other "motors" for the air upper/lower and air temp, Items 3 and 33.

All of these items are located on the same assembly behind the trim panel on the passenger side in the back cargo area.


As stated if the blower comes on when not commanded, as in when the truck is off, it is the Speed Control Module.
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Old 08-09-2011, 08:54 AM
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bromanjr bromanjr is offline
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Quote:
Originally Posted by TRAILBLAZINFOOL View Post
I also have a 2002 with a similar issue. Mine doesn't work at all though. Once you figure out what's wrong with it you can get parts at parts4chevy.com
"TRAILBLAZINFOOL"
The discussion and parts apply to the auxiliary HVAC located in the rear cargo area. Your profile does not state you have the EXT??
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Old 08-09-2011, 09:07 AM
toddwallace toddwallace is offline
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Quote:
Originally Posted by bromanjr View Post
The discussion and parts apply to the auxiliary HVAC located in the rear cargo area. Your profile does not state you have the EXT??
Yes, I have the EXT.

I don't ever recall the air coming on when the truck is off, but it won't come on when requested. It randomly comes on and off while driving..most of the time it is off..
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Old 08-09-2011, 09:12 AM
toddwallace toddwallace is offline
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2002 Chevy TrailBlazer LT EXT
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Quote:
Originally Posted by toddwallace View Post
Yes, I have the EXT.

I don't ever recall the air coming on when the truck is off, but it won't come on when requested. It randomly comes on and off while driving..most of the time it is off..
I was wanting to pick up the parts today versus ordering.. Is the dealership the best place to get the speed control module or is there somewhere cheaper? I am in the Dallas/Fort Worth Metroplex area...

We are taking a trip this weekend and would like to get it fixed for the people sitting in the back seats..
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  #10  
Old 08-09-2011, 09:30 AM
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bromanjr bromanjr is offline
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Quote:
Originally Posted by toddwallace View Post
I was wanting to pick up the parts today versus ordering.. Is the dealership the best place to get the speed control module or is there somewhere cheaper? I am in the Dallas/Fort Worth Metroplex area...

We are taking a trip this weekend and would like to get it fixed for the people sitting in the back seats..
The Dealer would probably be the only place to get it locally, some online places can have it to you overnight.

Search for the replacement procedure on the Site here while you wait.
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