2003 Chevy Trailblazer Environmental Control Problem
The A/C and interior fan seem to be working fine...as far as its cooling capabilities. The problem I'm having is the four main dashboard vents aren't blowing any air out...period. I think the problem might be the air vent selector switch (ya know the knob that lets you select where the air comes out). The only hitch to that is it'll switch it from floor all the way to defrost, but when I select the front vents, all the air comes out the floor vents. This all started about two weeks ago when I went out to start my TB, which I had driven just that morning without a problem. When I tried to start it up, it clicked once at me and then everything went dead. I checked the voltage on the battery and it only had about 3 volts. Obviously not enough to start a vehicle. I got a jump from my neighbor and went on my way. During my trip, the voltage meter constantly fluctuated anywhere from about 10 volts all the way up to 14. When I got to my destination, my buddy took me to Wally world and I got a new battery. Problem solved. Haven't had a problem since then. However, my vents are still not blowing any air out. Any suggestions as to what the problem might be?
Re: 2003 Chevy Trailblazer Environmental Control Problem
THE AIR SELECTOR MAY BE BAD BUT THE ARMS ON THE SIDE OF THE HEATER THAT REDIRECT THE FLOW LOOSEN AND WILL NOT OPEN THE FLAPPER, THIESE ARE LOCATED ON THE DRIVERS SIDE WHERE THE AIR BLOWS OUT ONTO THE FLOOR ABOUT HALF WAY UP.
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Smart man using a scanner for the actual temp. Assuming you're not losing coolant....2 things I'd look at here, 1st is you may have air in the system, make sure to purge all the air. 2nd is your fan clutch, I've replaced a few fan clutches in my own Trailblazer. Have had them bad right out of the box brand new. Have had bad brand new fan clutches on 2 of my last Trailblazers. You should hear it engaging especially in stop and go traffic.
There two common problems with the driver's door control panel, rain water gets into the module and damages the electrics or the wires in the door boot break or abrade and short out. To check out the control panel itself, take the passenger side panel and hook it up to the drivers side, if everything works, replace the driver's panel.
Hi. There happens to be a common problem with these trailblazers inside the ducting box located under the dashboard. The mode actuator door motor stops working due to a faulty motor itself and the default position is defrost only. As far as the Air Conditioning not working, there maybe another problem to diagnose there. Could be low refrigerant, or electrical problems to the compressor, or faulty fan clutch(another very common problem with these trucks). Type in mode actuator door and 2005 trailblazer in your search engine online i.e. Google or Yahoo and you will find many posts about this problem. I think there may even be a Youtube video about replacing it. Let me know you need more help. Thanks.
The fan clutch isnt engaged at all times, therefore it may be normal to hold it in place (not recommended). On these trailblazer's 4.2L engine the fan clutch is electronically controlled. Usually when this vehicle's fan clutch malfunctions, there is a random ticking noise while idling or at a stop, also the "service engine soon" may turn on. As for the the fan speed problem, this may be a faulty blower resistor malf (typical) or climate control unit may be faulty. Hopefully this helps!!