You need to ask a more complete question.
Inside the distributor
You see that knob you turn to run the blower? That's it.
How do you change the thermostat in 1999 Mercury Villager
Yes.
What is a gem module for 1999 mercury sable? And what does it control?
According to the 1999 Mercury Villager Owner Guide : ( 20.0 US. gallons )
In the engine.
134-A
No, no room.
In the fuel tank.
There are two.
4.5 quart