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Fuses are designate for the system they are protecting. In the under hood fuse block there are some post labeled aux. These are made for adding accessories. If that requires too much time and wiring then you can tap into the rear cigarette lighter type plugin with an adapter. Just dont leave plugged in as it will drain battery.
Hi Jeff. I had the same problem, along with others on my 03 Denali. Along with not blowing hot air from the rear heating system, I had hot air blowing out of the passenger side and cold air out of the drivers' side vents. My battery would go low and had the same smell. I took my Denali in to the dealer and they found it was a bad Fan Control Module. They replace it and everything worked well after. It cost me $293 for parts and labor. Hope this helps.
There is a blend door that blends the hot air from the heater core and the cold air from the A/C evaporator to make the air dry and just the perfect temperature. I am going to bet its the blend door. the Rear trim will need to be taken off and then you can see what is going on. I don't have any pic of the box but its not that complicated.
The wire harness is know to melt in your Yukon, there is a wire harness upgrade that GM has in there parts department to address your Blower motor issues. This harness has been updated to address the failures in the original (OEM) harness and previous versions of the AC Delco PT2195 pigtail and GM 15862656 pigtail. All wire gauge sizes have been upgraded to easily handle the current demands of the Blower Motor at all speeds. Heavy duty 12 ga. wires for the 12v power, ground (-) and the high blower circuit.
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You can not bypass you drls. I just put a hid kit in my 97 yukon. You have to buy a wireing harness that hooks into your harness currently on your truck. The only way to shut you dlrs off is you e brake
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