heater

Asked by jonfountain Dec 08, 2016 at 08:45 PM about the 1994 Mercury Grand Marquis GS Sedan RWD

Question type: Maintenance & Repair

Heater dont blow hot but if i rev engine up it
gets hot ... What's the problem

1 Answer
103,445

KenF answered 8 years ago

Either you have low coolant, or a weak/failing water pump, or a restricted radiator or some other sort of blockage in the cooling system. It gets hotter as you rev the engine because you are forcing the engine to push more coolant through the cooling system. But under lower RPMs, there isn't enough coolant flow to the heater core due to above mentioned reasons.

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