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You are probably out of antifreeze. Refill it only after it has cooled down to where you can put your hand on the engine without burning it. Then add coolant through the overflow spout. Then take it to a garage to find out where it is leaking. Monroe Muffler can check it. I WOULD TAKE IT SOMEWHERE ELSE FOR THE ACTUAL REPAIR BECAUSE THEY ARE VERY EXPENSIVE.

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Q: Your 2000 gmc jimmy is blowing cold air and over heating?
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