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Re: 99 blazer heating problems
If losing heat on a pull it points to weak vacuum or vacuum leak or a bad vacuum reserve tank or check valve.
The first thing would be to check for good vacuum from engine to heater controls.
If you can smell anti freeze inside be careful.
It is a health hazard to breath antifreeze fumes.
Check that heater core for leakage.
MT
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Remember proper testing gives us the answer to many problems.
MT
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