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classic symptoms of a blown head gasket.... have someone crank engine while you look at fluid with radiator cap off..see if bubbles come out ,that indicates combustion gases escaping into cooling system. also, see you tube video about combustion leak detector...you put blue dye in radiator, you pump syringe device ,to circulate dye....if blue dye turns yellow, you have blown head gasket....you can buy a combustion leak detector on internet for about 30.00 including shipping ,dye and everything.
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Why does Heater blows cold air on 2001 blazer?
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