Question about 2003 GMC Yukon Denali
I have been stumped on this issue for weeks on my 2003 GMC Yukon XL Denali (Automatic climate control). It started because the battery would drain after letting the truck sit overnight. I would go out in the morning, and battery was dead. Long story short, took it into the dealer to diagnose and he traced it to the auxiliary blower motor running when the car was off. I tore apart the rear trim to get to the auxiliary blower motor and sure enough, it ran on very low speed when the truck was off. When the truck was on, it would function at all speeds.
The dealer tech was going to replace the auxiliary blower motor module (resistor type thing), so I decided to do it myself. I ordered the new part in from GM Parts Direct and plugged it in. The new module blows on full speed with the truck off. When the truck is on, the fan speed cannot be controlled, it is only on full speed. When I plugged the old module back in, it worked fine when the truck was on, but still was running the blower on very low speed with the truck off.
Where else in the system could there be an issue? If the module isn't the issue, why are they acting differently?
Could be that the switch itself is shorting and allowing power to flow,if you can get to the switch I would use a voltmeter and see if there is voltage on the output side with the switch off.
Posted on May 14, 2010
Testimonial: "Getting on the right path"
Your new resistor should contain a built in relay. Sounds like that is sticking, swap the new part for another as it could be that you got a bummed replacement.
Posted on Jun 04, 2010
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Dec 04, 2016 | 2003 GMC Yukon Denali
Sep 11, 2014 | 2005 GMC Yukon Xl Denali
Dec 10, 2013 | 2006 GMC Yukon Xl Denali
Dec 08, 2017 | 2005 GMC Yukon
May 14, 2011 | 2005 GMC Yukon Xl Denali
Oct 03, 2010 | 2006 GMC Yukon Xl Denali
Jun 28, 2010 | 2005 GMC Yukon Xl Denali
Sep 01, 2009 | 2003 GMC Yukon Denali
Jun 28, 2009 | 2006 GMC Yukon Xl Denali
May 11, 2017 | 2005 GMC Yukon Denali
1,450 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: