There is a switch on the main A/C control console, which allows the air to be directed its entire flow into the front. When pushing the switch to the right,
the flow is divided between front and back, then the back side controls are enable to work.
Right inside the roof housing where the air comes out.
if it is equipped from factory it is mounted by the rear controls for the radio behind drivers seat
There is no such part on a Mercury Villager.
Top rear of engine directly under the air intake tube/throttle body.
In a 1998 Mercury Villager, the mass air flow sensor is located in the air intake tube. The air intake tube goes from the air box to the intake.
The Villager engine does not have a coolant bleed valve.
Under the dash.
There is no such thing on this vehicle.
Low coolant? Bad thermostat? Heater core plugged or airbound? Heat control cable not working?
Mass air flow sensor is mounted after the air filter.
Yes.
This should not be necessary on this vehicle.