I have a 2001 Yukon XL that the heat recently quit working correctly on. It appears to be leaking coolant, as the 'low coolant' light comes on frequently, even right after I add more coolant. If the truck is started and left running to warm up, the air coming out of the vents will not heat up...
My wife told me approx a week ago that the front vents had stopped working. I disconnected the front blower motor and tested the voltage coming out of the connector and it appeared that the voltage was around 12 volts when the fan was off and climbed to 13.5-14 volts when the fan was turned on...
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