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heating problem on 2000 Mercury Mountaineer

i have no heat in the truck could it be the thermostat in the past the trucks i had thats what it was but i do not know to much about this one 2000 mercury mountaineer V8

Asked by for the 2000 Mercury Mountaineer
If the engine is not getting up to operating temperature, or it is taking a long time, then I would replace the thermostat.
If the engine temperature is fine, then you may have another issue with the climate system or the heater core.