A failed heater blend door or actuator can cause the temperature control for the HVAC system to stop working. A clicking sound from the dash area would commonly indicate an actuator fault. If the heater gets stuck on the hottest setting, the heater blend door may be broken requiring replacement of the heater box to repair the issue.
Problems for specific Mercury Mountaineer years:
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Most reported 1997 Mercury Mountaineer problems
The rear wiper may stop working. This could be due to a rear wiper motor that has failed requiring replacement.
4wd vehicles may develop a squealing noise coming from the front wheels when driving below 30 mph. This is generally caused by dry excluder seals, lubricating the seals will commonly correct this concern.