My 1998 Mercury Villager, is not getting heat and the temp display does not move at all. I have looked and I cannot figure out where the the thermostat is located on this engine. Please advise. It is winter and it is too cold to go through this. It does eventually get warm air to the heater but does not maintain constantly. Other than this problem there is not problem with the vehicle. It is a dialy driver Thank You for your time. Jim

The thermostat is located on the end of the upper radiator hose where it attaches to the engine. Most likely the t-stat is not closing and will not allow the engine to get to operating temperature. Replacing the t-stat should fix this problem.

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If you follow top radiator hose back to the engine it's attached to a small housing. Beneath that housing is your thermostat. You'll need a new thermostat, gasket and coolant. Make sure you get a 192 or 195 degree thermostat. Any good parts store will be able to handle your needs