The rear wiper may stop working. This could be due to a rear wiper motor that has failed requiring replacement.Google+
Car Problem Reports
Mercury Mountaineer Replace Rear Wiper Motor if Rear Wiper Blade is Not Working
Mercury Mountaineer Problem
Average Mileage: 112,950 mi (42,000 mi - 220,000 mi)
Visitor, 2006 Mercury Mountaineer, 115,000 mi
motor in rear windshield wiper stopped working. makes a loud buzzing noise when I star the engine.
Visitor, 2004 Mercury Mountaineer, 90,000 mi
Rear wiper stopped working, could hear a clicking. At the same time battery kept dying, so I disconnected wiper motor. Battery was fine after that.
Visitor, 2008 Mercury Mountaineer, 70,000 mi
wiper stopped working. I can hear clicking noise.
Visitor, 2007 Mercury Mountaineer, 64,000 mi
rear motor stopped working
Visitor, 2000 Mercury Mountaineer, 175,000 mi
rear wiper motor does not move. fuses good relays work motor is tring
Visitor, 1997 Mercury Mountaineer, 63,000 mi
Rear wiper blade never worked after purchasing from previous owner. Does not move or make any sound when activated. Just want to find a way for me to fix without going to mechanic.
Visitor, 1999 Mercury Mountaineer, 175,000 mi
Wiper motor is intermittent, I have replaced the motor and switch still the same. Works when cold (below 65) but not when warmer. Last item to try is the relay.
Visitor, 2006 Mercury Mountaineer, 113,000 mi
Rear wiper does not operate. washer works fine.
Visitor, 2008 Mercury Mountaineer, 55,000 mi
Rear wiper will go up, but not back down. Will reset after vehicle has been shut off and restarted. Have not have it repaired yet.
Visitor, 2000 Mercury Mountaineer, 152,000 mi
Rear wiper works when it feels like it. but doesn't come in contact with glass fully when it does.