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Front defroster/hot air blower not blowing air, controls shows fan at max. Back roof air works fine. Was working, but when i turned heat/fan off, fan still ran then stopped. From that point no blower in front of Denali.
This is from the A/C Module located under the dash passenger side, check wether the internal fan is working if it is, then change the Module which is a small black part with two white metal blades like... and your A/C should work again...
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If your front blower motor isn't working on any setting, could be the blower motor itself, the blower resistor, or sometimes the wire pigtail to either one could be the problem.
Do you know how to do automotive electrical testing ? Videos on youtube showing how to do it . Does your Yukon have manual or automatic Heater/AC system ? Could be the blower motor is bad , blower motor control module (if automatic ) Do you hear the blower motor running ? 2005 Chevrolet Tahoe Blower Not Working Chevy GMC same thing
The resistor pack is to help control fan speed. Either your temp control door is stuck/unplugged which doesn't seem likely with rear blowing hot too. Could be temp sensor reading incorrectly, even then commanding full cold should do something. I would start with the person you just paid to work on it or you'll be paying someone to diagnose it.
Here is a TSB (Technical Service Bulletin) for your vehicle for loss of temp control. File In Section: 01 - HVAC Bulletin No.: 01-01-39-007 TECHNICAL Subject: Loss Of HVAC System Mode and/or Temperature Control
(Reroute Wiring Harness)
Models
1999-2002 Chevrolet and GMC C/K Pickup Models (Silverado and Sierra) 1999-2002 Chevrolet and GMC C/K Utility Models (Avalanche, Suburban, Tahoe, Yukon, Yukon XL, Denali) 2001 GMC Sierra C3
2002 GMC Sierra Denali
2002 Cadillac Escalade, Escalade EXT
Some customers may comment that they cannot control the HVAC system modes and/or the temperature. These concerns may be intermittent.
Cause
There may be poor terminal contact and/or bent terminals in connectors C206 (RPO C68 automatic HVAC controls) or C296 (RPO C60 manual HVAC controls). Excessive tension on the wires due to the wiring harness being miss routed in the instrument panel carrier may cause these conditions.
If the warranty campaign is over i am sure they can or may have in the system on how to correct the problem.
Good luck and hope this helps, keep me posted if you need help on to the repair procedure.
My wife had same problem in 2005 yukon. Turn both temperture controls on dash all the way as warm as they will go, Wait about 1 or 2 mins and turn back to coolest setting. Cleared our problem right up. Do this with car running and air on.
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