Chevrolet TrailBlazer Heating Ventilation Air Conditioning
hot air blows out of the drivers side and cold air blows out of the passenger side. It does this no matter where the temperture is set on the drivers side. I heard about another one that was doing this and all they did was turn off the car and then restart it and it started working again. I tried this and it still blows hot air out the drivers side with the AC set to high.
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.
I've tried some other web sites but found nothing there either. Any suggestions would be much appreciated. Thanks
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.
The rear controller has two servos, one that selects either heating or air, and one that controls whether the side or top vents are selected. The servos are located with a blower motor behind the passenger rear tire. The controller is under the 2nd row passenger seat along with the fuses.
Hope this helps.
I would make certain that you turn on the rear AC to full cooling through the roof vents in addition to the front. Otherwise by just using the front you're cooling down the rear condensor but not running air through it.
When we go to our home in Arizona with our 02 Trailblazer we notice this quite often in the summer. If it's retarted while still warm, or if it's been sitting in the sun during the hottest part of the day, it won't come on right away, it usually takes 30 seconds to a minute or so of sustained driving (stop and go makes it longer) until the compressor comes on. If it's been in the garage, even if the air temperature is 110+, it will turn on right away as long as the condensor is not heated up from a hot engine.
There's no way to change it I'm aware of. Really though, "Our Lexus takes just seconds to cool the car". On a hot day it takes a little longer than that, right?
I took it to the dealer and they replaced the "body control module" and within two days ( only because I assumed it was fixed) I noticed the blower coming on, same as before.
Any ideas? Thanks
how did you fix yours
When I select defrost or heat at the feet, a portion of the flow does come put on the selected mode however it never stops coming out of the vent mode.
Can someone tell me what needs to be replaced?
I apologize that you have a concern with your vehicle. Can you please email me with more information about your situation so I can look into this further? You can get my email by clicking on my name. Thank you,
Mariah GM Customer Service
I have a 2003 Trailblazer and I am having a similar problem. I recently replaced my battery and now the A/C is only blowing at my feet and side vents regardless of the control settings. I see on some postings it is a bad resistor or a faulty ground. Is this something that I can check.
You can check it yourself or have a service technician look at it for you. Unfortunately I cannot tell you how to fix your vehicle if you are planning on doing it yourself. If you have any further questions please let me know. Thank you,
Mariah GM Customer Service
I have a 2006 Chevy Trailblazer, I replaced the battery and now the AC will not blow cool air. I checked all the fuses is there something that I am missing?
The Air is blowing, and when I push the AC button it lights up, but no cool air.
Can anyone help me troubleshoot this problem?