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Re: Front air condition does not blow cold. Rear air...
Sounds like a damper door in the front not working properly, these are actuated by the front temp control, the door is operated by either a manual cable, and electric actuator, or vacuum. I hope this helps you zero in on your problem. Merry Christmas
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www.tahoeforum.com > ... > Technical Discussions Dec 5, 2008 - 10 posts - 7 authors
2001 Tahoe, the front heater blows a little hot air when the car warms up and then blows cold air. The rear heat seems to work fine. I changed ...
often on the vans with rear air the air dor acuator goed bad and can no longer switch from hot to cold. also the swich itself will often go bad. this can be caused by sticky fingers damaging the inside of the switch. sometimes a good cleaning in warm water will fix a sticky switch
This is a common problem and the solution usually is that the fron thermostat is usually gone and needs replaising. Shouldn't be too much money to get done. It's just not opening up to let the cold air pass into the from area but the rear one is working fine which allows it to blow cold air.
Yes! You are absolutely right, sometimes when you drive on rough roads, the lines from the condenser(cold air module) may get loose and you lose your cold air. The fact that it's blowing in one part of the vehicle and not the other is a testament to that. The best advice is to get the air conditioning checked out. they do this really neat thing where they pressurize the line to find out where the leak is coming from. Hope this helped.
I know this is late and hopefully you have this fixed, but the problem is probably the air diverter door control. There are 2 doors, 1 front, 1 rear (middle) and they are adjusted by a single control to balance the temp front and back based on the controls. If this goes out, you either are stuck with hot air up front/cold air in back or vice versa. You can try manually moving the doors to see if they are stuck (in the duct work) or test the actual control circuit. Check your tech manual for how to do it.