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Car is overheating and heater blows cool air. on 1996 Oldsmobile Cutlass Supreme

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
Replaced water pump but did not help. What else could it be?
(2) Answers
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Did you bleed the air from the cooling system? There are bleeder valves that need to be opened to expel air from the cooling system after you service it. If you didn't you probably got a air lock in the top of the engine radiator and overflow tank will appear full, but you will have anything flowng through the cooling system. Other possible problems are thermostat, radiator or heater core blockage.
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