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06-02-2011, 02:37 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: Need help on HVAC schematics
Typically its a 1 hour charge for a module reflash with no guarentee that will fix it. Like easyed said, bit of a pain to change it out. Easiest way i have found is to remove the upper dash panel and you can access it from there. Not a terrible job just will take some time if you dont have much experience with gm trim panels.
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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06-02-2011, 02:39 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: Need help on HVAC schematics
Oh and any gm dealer can do the reflash, we all have the same access to programming as its all web based
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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06-02-2011, 02:42 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: Need help on HVAC schematics
What year is your Hummer?
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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06-02-2011, 02:45 AM
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Hummer Professional
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Join Date: Jan 2011
Location: Clayton, NC
Posts: 370
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Re: Need help on HVAC schematics
I don't trust the local chevy dealer, they give me bs everytime I go by, I'll just go to the HUMMER Dealership...
I have changed the actuator for the rear Hvac in a Tahoe... but you only have to remove a rear panel and everything is there.... so much easier.
Anyways, I appreciate the help from both of you, the HVAC system sucks as it is, without the recirculate it's nothing.
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06-02-2011, 02:46 AM
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Hummer Professional
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Join Date: Jan 2011
Location: Clayton, NC
Posts: 370
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Re: Need help on HVAC schematics
2003
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06-02-2011, 02:48 AM
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Hummer Professional
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Join Date: Jan 2011
Location: Clayton, NC
Posts: 370
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Re: Need help on HVAC schematics
tbh wouldn't it be possible to just manually move the door and disconnect the power, would there be any drawbacks from leaving it open permately, such as with the defrost on?
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06-02-2011, 02:49 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: Need help on HVAC schematics
Rechecked for bulletins for an 03, none found other than the one mentioned above
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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06-02-2011, 02:52 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: Need help on HVAC schematics
If you get close enough to the actuator to disconnect it its easy to replace from there. Do you mean close it so its always on recirc mode?
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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06-02-2011, 02:53 AM
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Hummer Professional
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Join Date: Jan 2011
Location: Clayton, NC
Posts: 370
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Re: Need help on HVAC schematics
Question the Tech 2 computer that they will hook to my truck.. will it download ALL updates, or just the specific one I'm having trouble with?
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06-02-2011, 02:54 AM
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Hummer Professional
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Join Date: Jan 2011
Location: Clayton, NC
Posts: 370
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Re: Need help on HVAC schematics
Yea...
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06-02-2011, 02:54 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: Need help on HVAC schematics
Can only flash one module at a time
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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