Question about GMC Yukon

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I have a 1995 GMC Yukon, last weekend my blower motor cut out than back on and since than I have not been getting any heat. I fluched the heater core, replaced the lines to the heater sore, sut the lines out for the rear heater core, still no heat. I have checked the temp going in and coming out of the heater sore, 20 degree difference. The t-stat seems to be workin fine. Checked the upper rad hose that goes to the t-stat its at 180 and the lower is around 155 to 160. I havwe forced the temp blend door to hot and still nothin. Please help I am driving myself bonkers trying to figure it out.

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If you have 20 degrees difference that is quite a bit of a difference.i would say that the heater core is plugging up,remember the fan blowing air across the core is cooling the temp more and with a 20 degree difference its alot.you can try to run CLR through it a couple of times to see if it will help flush out more dirt.sometimes flushing just doesn`t do it.

Posted on Apr 08, 2011

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