Question about 1993 Mercury Villager

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My van only blows heat while parked and goes cold while driving, can you tell me what's wrong?

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Sounds like a stuck thermostat, you see, when the vehicle is sitting there isn't as much airflow over the radiator, with the thermostat stuck in the open position the water / coolant in the engine doesn't have time to absorb much heat from the engine, but because of the lessened airflow it will get warm enough to feel. while in motion the constantly moving coolant is being constanly cooled by the radiator, fan and increased airflow.

my suggestion is to change the thermostat.

Posted on Feb 02, 2010

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Posted on Jan 02, 2017

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Change the thermostat. Follow the top radiator hose to the engine. There is to T stat. That will get your heat back. on the defroster, it doesn't blow out air? doesn't switch vents? or just not get hot? Year make and model please.

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You have an air pocket trapped in the cooling system. This is pretty common on this vehicle due to the fact the heater core sits higher in the vehicle than the top of the radiator.
To correct this jack the front of the vehicle up or park it on an incline. Remove radiator cap then run it until hot,run rpm up to about 1500 and watch bubbles in radiator then top it back up with coolant until u see a steady flow thru radiator.

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Sounds like your thermostat is not functioning properly. Go on line or get a manual on your van and see if its a big job. Most thermostats are pretty easy , but there are a few out there that are bears to get to, Hopefully yours will be an easy one

Good Luck

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