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The first thing to do is check the radiator, not the overflow tank, to be sure it is full. Next, with the engine warmed up, feel both heater hoses. They should be the same temperature. If not then the heater core is stopped up and will require back flushing. If they are the same temperature then you will most likely have a blend door problem.
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I am Having problems with your heater core removal on a1999 gmc sierra 4.3l?
Well get a new car and then work on this peace!
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bs
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