Low coolant?
Bad thermostat?
Heater core plugged or airbound?
Heat control cable not working?
There would only be a rear heater core if there was a rear heater, which I don't believe was an option.
There is no such part on a Mercury Villager.
yes!
System airbound and needs to be purged
Yes, it should fit.
Yes you will have a heater control valve but try and locate one from other than the dealer because it will cost you around $135.00 dollars.........
134-a
Buy a manual.
No, there is no "adjustment".
4.2 quarts
walmart
Powertrain Control Module