05 Yukon overheating at highway speed and heater won't heat

Asked by Oct 08, 2016 at 09:18 AM about the 2005 GMC Yukon XL 1500 SLE 4WD

Question type: Maintenance & Repair

1 Answer

345

The fact that both the cabin heat and the engine overheating I believe is a sign that your thermostat is bad. The thermostat is a mechanical valve that runs in-line of the coolant pipe between the engine and the radiator. When the coolant gets up to the optimum temperature, the valve pops open and allows the coolant to circulate. I think that is your issue.

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