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Chevrolet TrailBlazer Heating Ventilation Air Conditioning



  • tigartigar Posts: 1
    I have an 06 trailblazer that the air works sometiomes usually when it's cooler. Other times the compressor is running but no air/blower at idle, when I start moving I get cold air sometimes but not maybe as powerful as it should be. When I stop at a light it stops again. Not related I don't think but I have replaced the mass airflow sensor and O2 sensor recently ( lean condition in bank one). Thought it might be a vacuum leak or hi speed blower relay. Any ideas ite 90 dewgrees here and need the air fulltime.
  • scott198scott198 Posts: 1

    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.

    Any Ideals

  • I have a 2003 Chevy TrailBlazer V8. The air condition cuts out every now and then. When it works, it works well, When it cuts out the air is ambient or hotter. I contact a mechanic and they said it is not freon, but maybe the electronically controlled doors in the dash. One door is about $300 and the other is $500. Could it me something else or does sound about right?
  • burdawgburdawg Posts: 1,524
    I'd have it looked at for another opinion. When it "cuts out" is the compressor running?
  • I think the compressor is running. I happens when I am driving so it is hard to tell.
  • Blower stopped working but compressor still works fine. Went to install a new blower and found that I had a wiring problem: Burnt ground between motor and resistor. Found several places on the wire that had been hot and had damage but only one place where the wire was burnt in two. I replaced the ground and it lasted for about a week. Question: what is causing the ground wire to get so hot? Any suggestions?
  • I have a 05 chevy trail blazer whereby I hear a resonating, tuning folk-like sound coming from the right, passenger side dash of the vehicle. This sound is very low and intermittent. It is heard when the AC is on. The blower blows cold air after about 3 to 5 minutes of being turned on.

    Can anyone help me troubleshoot this problem?


  • a couple of months ago the 5 setting on my air-conditioner and defroster did not work. then all of the sudden it started working. 2 months later i have a horrible smell coming from the vents when i have the heat/defrosters on. it smells like burning plastic or electrical. what would be the cause of this?
  • burdawgburdawg Posts: 1,524
    A burned or burning resistor or resistive strip on the blower motor resisitor assembly would be my guess.
  • I have an '04 Trailblazer. My #5 setting on my air-conditioner works sometimes and sometimes it don't. Also my air only blows out the defrost vents and the floor vents. Then also when my A/C is on my car has a tremble/idle problem, especially when at a stop light/stop sign. It sometimes turn off. I took my truck in yesterday to an auto shop they could not repair the problem with the #5 setting because it was working at that time so they couldn't diagnose the problem. But the tremble/idle problem they said it the throttle bore that needed cleaning. They said it got coking (not sure if I spelled that right but it sounds like that lol) and that sticks to the throttle bore and it restricts air. And the air blowing out some of the vents problem was due to a bad actuator. They said there were several actuators (IDK) but the actuator in vent for mode applications was bad. Every problem I have had I came on this forum and it shows people entering tons of problem with the same issue. I have even seen reviews from people that has '07 or higher chevy models and they are having these problems and it is ridiculous. I will NEVER buy another chevy/GMC vehicle again. These forums have really helped me to get to the bottom of some of my problems so I could go to a dealership like I know what was going on. But this is ridiculous and chevy does not do a recall on any of this.
  • It is probably your after blower. Basically it is a factory default that helps dry our any condensation in you AC vents. It's a good thing, but I think it has contributed to the early demise of my blower resistor.
  • gabby69gabby69 Posts: 1
    04 LT electronic AC & Heat controller. Regardless of mode selected air conditioning only comes out floor vents.
  • blazin02blazin02 Posts: 1
    We have a 2002 Chevy Trailblazer, we purchased this fresh off the lot in late 2001. We too have had problems, the speakers in the back don't work, the rear defrost has gone out twice. and now our heating and air conditioning blower stopped working 7/11/11. First we lost #1 & #2 in 2004 and a couple of months later we lost #5. So we were left with #3 & #4, well we lost those now too. It seems like this is a common problem. Does anyone have an easy fix for this? :(
  • burdawgburdawg Posts: 1,524
    Most likely it's the fan resistor. Have a look at this:
  • bvandebvande Posts: 1
    I have a 2009 TB. The amount of cold air coming out declines sugnificantly when the car is running a slow speeds (35 mph or less). However, it seems to produce a fairly good amount of cold air when the car is at 50-60 mph. I also notice a lot of condensation dripping from the metal hose on the left side of the engine compartment under the water resevior when the car is idling in the drive within 30-60 seconds of starting the car. I can't see exactly where the leak is coming from if it is even a ture leak. Before I take it in to a dealer to be ripped, I would like to know if I am look at a major problem or something more common such as a refrigent leak or bad seals. Can anyone give me some advice.
  • not sure about the cold air.. but i had a leak a few months ago... come to find out when you open the hood of your tb look at the left back side theres a rubber 90 degree piece that points down... usually it gets clogged and backs up into the cab.. Pull it off and use a pipe cleaner.. this worked for my 04 trailblazer
  • I have an 04 trailblazer that the rear ac only works on high. sometimes it works and sometimes it dont... And to top it off sometimes it runs when the truck is completely turned off.... How the heck does that happen???
  • Have a problem that I'm hearing is more common in the 2003 chevy trailbaizer EXT. Both the heat and A/C will now only work on the 5 setting, we noticed ealrier in the summer that occasionaly the air would work only on settings three or higher, however recently the only output we now have is on setting 5. Also with the heat on regardless of the level I now have only cool or cold air being blow into the middel and rear zones. Any ideas or advice would be greatly appreciated, signed desperately seeking heat in cold OK winter.
  • I Just changed my battery in my 2004 LS TB, when I turned on the ignition my AC/Heat only works on defrost vents and a little from the floor vents no matter where I turn the vent control knob. When I key up to accessory I can here something humming or chattering, sounds like coming from top, center of dash. Has anyone experienced this or have any ideas on fix. I appreciate any help you can give me in this matter.
  • rsugarek said:
    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. Any suggestions. Thanks
    Ignition switch, trust me as crazy as it sounds.

  • I have an '04 Trailblazer that I bought used with 19,000 miles on it. Over the past year, I started having problems out of it and am slightly disgusted with it. I love my trailblazer but am afraid that Chevy may have produced a few lemons with these vehicles. I had to replace the alternator about a year ago. Less than 2 months later, it had to be replaced again. Then the battery died and had to be replaced. When the battery died, it began a whole new set of problems. My passenger and rear vents will only blow out heat no matter where I set the temperature to on the climate control. If my fuel level gets low enough for the fuel light to come on, within a minute or so the fuel hand will start going back up like I'm pumping gas in to it. The check engine light is constantly coming on and off. If I turn the fan on high, I get a vibration noise. I took it to a dealership when the AC stopped working correctly. I also told them about the other problems I was having. They said that my HVAC control head, blower motor, and passenger side actuator were all bad and needed to be replaced. They charged me $100 to tell me what was wrong and then wanted $2000 to fix it. They still didn't tell me what was causing the rest of the problems. My car isn't worth much more than the AC repair cost at this point. Anyone having any of these problems? Can some of this be fixed on my own? I have a friend who is a mechanic and he said that this wasn't very complicated. He even gave me a printed diagram of where everything is located as far as the AC parts go, but I still have no idea about the other problems. Any suggestions? PLEASE help!!!!

  • Ignition switch.
  • If the Ac works and all of sudden switches to hot out of only one side of the vents and once you shut the  The  vehicle off it goes back to normal it's the door bend  actuator real simple to replace its located under the right side of the dash to the right of the center consol where your feet go cost $20-30$ 
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