depends is it the thermostat housing or the gasket. it is either connected to the hose or the water pump
In front of the engine, down in the "V".
The bulb end goes toward the engine.
At the front of the engine under the housing that attaches to the coolant crossover tube assembly.
There is no such part on a Mercury Villager.
yes!
System airbound and needs to be purged
Yes, it should fit.
No, there is no "adjustment".
Buy a manual.
134-a
Did you put the thermostat in backwards? I would check to see where the steam is coming from. I had to change out small hoses for the same problem with mine.
The pellet, the copper part opposite the spring with the temperature on it, always goes "into" the engine. The spring end should face out.