Last post on Aug 12, 2012 at 6:16 PM
You are in the Chevrolet TrailBlazer
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Chevrolet TrailBlazer, Chevrolet TrailBlazer EXT, Heating / Cooling, SUV
#3 of 52 heater blowing out
Mar 12, 2008 (11:47 am)
i just bought a 2002 tb im having the same problem hot air comes out no matter what even if i have everythiing turned off....what can i do..?
#4 of 52 Re: Heater Blowing out of Drivers side with AC on [ticadoo]
Mar 12, 2008 (1:15 pm)
I took it to the dealer and paid them $100.00 to diagnose it. They wanted $600.00
to fix it. So I figured I could do it myself, I am a pretty good mechanic. I took the dash, center console, everything there was to take off where the blower compartment is. I still could not get to the part that I needed to change out. So I put it all back together a weekend wasted. I then took it to a local shop here by where I work that we take our company trucks to get worked on. They seem to be pretty good. I told them what it was doing and he said oh yeah that it the heater control flap, or something like that. He said that is a common problem on this vehicle. Worst case scenario it will take 4 hours to fix. I already had the part and he said he could just use it. $240.00 for labor later and it is working fine.
The GM part # is:
ACDelco part # is:
Do a search online and you can get it for around $80.00, or from the dealer for $153.00
I would suggest calling some shops and asking them about it and if they say oh yeah that is a common problem then take it to them to get it fixed.
#5 of 52 Re: Heater Blowing out of Drivers side with AC on [rsugarek]
Apr 23, 2008 (8:52 pm)
I have a 2005 Chevy TB my 1st problem was no dome lights when doors are open, only hot air blows from drivers side, then no air at all. After checking all fuses and reading messages from this site and others I thought it might be a loose or shorted connection. I checking the rear fuse panel when I noticed when I pushed on the carpet to the rear of the panel the dome light came on. I then took the seat out and inspected the fuse panel. The top pan was loose. I tightend the three bolts and all works as advertised. Hope this helps.
#6 of 52 02 Trailblazer rear ventiliation problem
May 02, 2008 (10:33 am)
I have an 02 Trailblazer that has the air vents in the roof for the back 2 rows, and since we've had it, they've never worked. The floor vents work fine, but no go on the roof vents. Anyone have a solution for this? Could it just be a fuse or is something more mechanical messed up? Thanks.
#7 of 52 Re: 02 Trailblazer rear ventiliation problem [scarr133]
Jun 08, 2008 (3:17 pm)
I have the identical situation. An '02 Trailblazer EXT. Original owner. Roof vents worked in the past, but no longer. Floor vents in rear are fine. I've tried all the possible fuses (at least that I can find) and still no luck.
I've tried some other web sites but found nothing there either. Any suggestions would be much appreciated. Thanks
#8 of 52 Re: 02 Trailblazer rear ventiliation problem [agilkison]
Jun 24, 2008 (8:07 pm)
I hope you have better luck than I. The back heater/AC unit is on the passenger side. There is a servo to control heating and cooling, and another to send air to the floor or roof. Plus fuses under the passenger seat on the driver's side. The computer that controls the servos is near the fuse box. My heating and cooling servo ticks, and is stuck, and the servo for the roof doesn't move at all. But worst of all I have leaks in the AC lines going to the rear unit. The lines are $500 each, plus I'm told about $1500 in labor as they are each one piece. I'm hoping we can bypass the rear AC unit. Might fix the servo's so we still have heat.
I have 78,000 mi. and have replaced a rusted out tranny oil cooler line, a power stearing line, both front wheel bearings, and had to repair a rear tail light housing. I've needed front shocks for the past 20,000 miles. The trucks loaded, with things that are going to break.
#9 of 52 Front Blower Intermitent
Mar 15, 2009 (10:38 am)
Front blower blows sometimes, sometimes not. Anyone else have this issue? I don't think it would be a fuse because if a fuse was blown, it would never blow. Rear unit works just fine. Is there a control module for the front fan?? I don't want to have someone spend hours and hours trying to diagnose it if I can do it myself. Any help would be appreciated.
Mar 27, 2009 (8:08 pm)
i have 03 tb ext front blower motor only worked on 5... it was the modual conected directly to the blower behind the glove box. easy fix 20 mins. $56 cdn for new part.... i also have a problem with the the vents for the back rows, they only blow cold any ideas?
#11 of 52 Re: blower motor [blazer6973547]
Mar 28, 2009 (12:38 pm)
No earthly idea. My rear unit works just fine. Good luck with that one. I appreciate the info for the front unit.
#12 of 52 Re: blower motor [keith_h1]
Apr 03, 2009 (12:51 am)
to make things worse, i was trying to figure it out and i get heat in the rear floor ducts but it is only the top that blows only cold