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    No heat when fan on 4 or 5

    Hello Folks, new on here. I'm sure i have duplicated this question but dont seem to find an answer. I have a 2001 Yukon xl slt, rear heat works fine. Front heat worked in the morning, stopped for 2 hours and the heat blows cool on fan speed 4 or 5 and blows warm on 1 thru 3. It seems to get...

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