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What is wrong with a 2002 Chevy Blazer that gives a little heat when the blower is on low but blows cold air when on high?

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2004-12-13 22:46:27
2004-12-13 22:46:27

I own a 1999 Blazer with a 4.3L vortec engine. I had this problem and solved it by topping up the coolant level. I found if the coolant level got even a little bit low the heater would only blow out lukewarm or cold air. I know this sounds simple but it worked for me. DL Vancouver Island British Coulmbia

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