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Plugged heater core maybe.

Maybe the thermostat. Coolant keeps your engine cool under duress. If the thermostat is stuck open, the engine is staying too cool. Your heat is run off of your engine temperature.

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โˆ™ 2015-07-16 18:23:42
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Q: If a 1998 Mercury Cougar heating system does not blow hot air but there is plenty of coolant in radiator what could be the problem?
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