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heater core may be partially plugged up or the heater hose may be collapsed so that in motion the cold air can contribute to cooling the small amount of coolant reaching the heater but at a motionless idle the warm engine compartment helps keep the heater producing warmth

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15y ago

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How do you replace the thermostat on a 1998 Mercury Cougar?

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Where is coolant temperature sensor located on a 99 Mercury Cougar?

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Where is thermostat located on 2002 Mercury cougar?

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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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