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It could be like my 95 F250. The fan tips on the water pump were rusted off. It would keep the engine cool but the pump could not push water up to the heater. Replace water pump. Took me 2 hrs to replace water pump and 100.00.

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βˆ™ 12y ago
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Q: Why would heater blow only cold air on 1985 delta 88?
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