Have had your water pump replaced lately?Does your coolant reservoir boil over?Check to see if your radiator has been bled to remove air in your system.I have a 96 villager that was doing the same thing.First remove the radiator cap,turn your van on and let the engine reach normal running and allow the thermostat to open,you will notice the fluid level drop,then add the appropriate level of fluid,put radiator cap back on and test drive.This should solve the problem.If not you may have a bad thermostat.
You would need to be more specific with your question. You are not providing enough information to supply a meaningful answer.
How do you change the thermostat in 1999 Mercury Villager
Yes.
The most likely cause is an intake manifold gasket leak (that is if all the hoses and water pump have been ruled out)
According to the 1999 Mercury Villager Owner Guide : ( 20.0 US. gallons )
In the engine.
134-A
No, no room.
on my 1999 ford mercury villager its on top of transmission under the van
4.5 quart
In the fuel tank.
There are two.