Probably because coolant level is low
It is important to have a diagram when repairing a heating system in a car. A Mercury Mountaineer heating system diagram can be found in its maintenance manual that can be found at auto part stores.
There are two ports on the air conditioning compressor on the Mercury Mountaineer. The refrigerant to recharge the system is to be connected to the lower port.
I believe it has ( 2 ) because the ignition system is EDIS ( Electronic Distributorless Ignition System ) on the 2002 Mercury Mountaineer V8
Supplemental Restraint System - air bags
When the temperature drops, the mercury in the thermostat contracts, causing it to tilt and complete an electrical circuit that turns on the heater. This circuit allows electricity to flow through the heating system, activating it and raising the temperature in the room.
the boiler.
A 2002 Mercury Mountaineer has the Electronic Distributorless Ignition System ( EDIS ) With the 4.0 L , V6 engine there is ( 1 ) coil pack With the 4.6 L , V8 engine there is ( 2 ) coil packs
The power steering might whine on a 1998 Mercury Mountaineer because the pump or reservoir is low on fluid. Check the reservoir and add fluid to eliminate the whine. You may have a leak in the system.
No , ABS is the anti-lock brake system
A malfunction in the air bag system has been detected
Could be anything from an ABS system fuse , sensor etc . malfunction
There is no dipstick, the transmission is a completely sealed system. You have to take to dealer for service.