20 Most Recent 2005 GMC Yukon Xl Denali - Page 7 Questions & Answers

It's possible the HVAC needs to recalibrate itself, try the following;
With key on, set all HVAC controls and switches to their OFF or CCW positions. Turn key off, disconnect battery for a few minutes, then reconnect battery. Turn key on, but do not touch any HVAC controls for about 2 - 3 minutes. After that, see if the vents and all other functions work. If this does not solve the problem, either the mode control actuator(s) or mode door(s) are stuck or defective.

did you tune it up after 100,000 miles check fuel filter and also inspect all vacum hoses

Check to see if the allignment is correct. The little bar that the latch hooks on to might have moved over time. Just loosen the wee holding screws and adjust it until it works again.

I can tell you at a premium, if you are prepared to pay R340.00 please let me know.

Does it work on any speeds? If it still works on high then the blower resistor is bad. On the passenger side under the glovebox is the blower motor and resistor.If possible try wiggling the pigtail plugs that attach to these two components.It is not uncommon to have problems with these pigtails.Also try tapping the bottom of the blower motor to see if it will start working again.If it does The connections are poor and need repaired. If the blower will not work at all check for power at the blower motor pigtail with a test light or dvm. Will be glad to assist further if more assistance is needed.

UNPLUG THE FUSE AND JUST USE THE BACK HEAT UNTIL YOU COULD GET IT FIXED! SHIRLEY COULD PROBABLY FIX IT!

It is very likely that I can provide the diagrams and instruction that you need. Please click on any one of my ads on FixYa or simply click the link next to my screen-name below to visit my FixYa profile. There you will find a tab that says "Pro Services" click any of the links under this tab to sign up for email support. Please include the Year, Make, Model, Engine Size, and whether your vehicle is 2-wheel drive or 4-wheel drive, along with a detailed description of what it is that you need assistance with, and I will be honored to help you.

are you talking about the actuator that unlocks the hatch?

if it works in any position low-to-high then it is the blower motor. if it only works on high or works well on high but no where else it is the resistor. Good luck!