SOURCE: torque converter solenoid stuck off DTC
There is a solenoid switch that locks up your torque converter to get a 1:1 input for your transmission. This solenoid (or less likely its circuit) does not operate. You probably don't feel the difference in driveability but this definitely affects fuel mileage of the car... The solenoid for your particular application is available for about 60$ Canadian at NAPA auto parts here in Canada. Not too sure about USD$ and labour costs...
SOURCE: 2002 mercury mountaineer 4.0 starter relay location
The power distribution box is
located in the engine compartment.
The power distribution box contains
high-current fuses that protect your
vehicle’s main electrical systems
from overloads.
The starter relay is in position #56 of that box.
SOURCE: cabin filter location mercury mountaineer
There is one for the 2003 Mercury Mountaineer. If you are smellign a "vinegar" odor, mix a solution of 1 part bleach to 3 parts water and pour it down the grid at the base of the windshield. It will take care of the smell.
SOURCE: 2005 Mercury Mountaineer rear end whine, how hard to fix
Before you do this you might want to try fresh gear lube. On Ford products they use a synthetic additive in the rear and not in the front 4x4 axle.
The next thing would be to determine if it is a wheel bearing or a pinion bearing. You have to pull the axles and eliminate them as the problem. You might get lucky and not need to do the pinion.
The technical part of shimming the pinion gears with replacing the pinion bearing is about the worst part of the job. You won't know about the gears until you see them. You will need extra shims on hand.
It is a moderate job for two people. If you have all the parts it can be done in a day.
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SOURCE: Where is the fuel filter located at on a 2006 Mercury Mountaineer
it should be on the inside of the frame rail
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