One problem related to windshield wiper/washer switch has been reported for the 1998 Mercury Mountaineer. The most recently reported issues are listed below.
The rear window wiper does not always come on when the switch is turned on, the wiping efficiency of both the front and back wiper is poor, there is no contact with the window.
| Defogger Heater problems | |
| Wiper problems | |
| Windshield Wiper/washer problems | |
| Rear Window Wiper Washer problems | |
| Windshield Wiper/washer Switch problems | |
| Windshield Wiper/washer Motor problems | |
| Side/rear Glass problems |