Asked in
Mercury Villager
1995-2005 Chevy Cavaliers
How To

How to replace the thermostat in a 1999 Mercury Villager?


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Wiki User
December 11, 2010 1:25PM

This is a pain. Remove the old one and put the new one in. Use _only_ a genuine Nissan thermostat or the dingleberry may be incorrect causing incorrect warm-up time. You may need some glue to hold it in place during installation.

What a horrible answer....

Here is how you do it.

1. Disconnect the negative battery cable from the terminal. Drain the cooling system so that the level of coolant is below the level of the thermostat.


Remove the thermostat housing and set it aside. Lift out the thermostat.


Set the new thermostat in position. Make sure the jiggle valve is in the upright position. Replace the thermostat housing.


Refill the cooling system with the appropriate type and amount of coolant. Replace the radiator cap securely.


Reconnect the negative battery cable to the terminal. Start the engine and allow it to run for several minutes to warm up. Check for proper operation.

· Make sure the engine and the radiator are cool to touch before proceeding with the installation of a new thermostat. Never lay tools or engine parts on the battery or on top of the engine.

· Drain the coolant into a container that can be sealed. Ingestion is usually fatal. Properly dispose of coolant that's contaminated or several years old.