Mercury Mariner Repair and Maintenance
A guide to problems, costs, maintenance and repair for your Mercury Mariner
Never overpay. Check prices with our estimator
Verified by mechanics, reported by drivers like you
Ask a mechanic in our community
Our experts translate recalls into plain English
Mercury Mariner ProblemsA/C Fan Speed Changing Constantly
The Mercury Mariner equipped with automatic temperature control may have a problem with frequent fan speed changes when using the heater or air conditioner. Normally, the fan speed changes only to maintain a selected temperature, but when the fan speed changes frequently and needlessly, there is an issue with the fan speed control unit.
The fan speed control unit, sometimes erroneously called the blower motor resister, regulates the speed for the blower motor in order to maintain the temperature set by the driver. When it fails, the fan will run at random settings, and the climate control will be inaccurate.
Note: this does not affect the temperature of the air that comes from the vents, it affects the amount of air that comes from the vents.
The repair is simple, and quick. The control unit is located behind the glove box in most models, and removal and installation takes only minutes.
Also note: this only applies to vehicles with single or dual automatic climate control.
The 2008-2011 Mercury Mariner with manual temperature and fan controls may have problems with the the blower motor only blowing air on certain settings. Most commonly the fan will only run on the highest setting. This is a well documented problem, and is caused by a failing blower motor resistor.
Correcting the problem is straight forward, and requires replacement of the small resistor. The resistor is normally found behind the glove box, next to the blower motor.
The check engine light may come on due to failure of the Variable Camshaft Timing (VCT) solenoids. The VCT solenoids will need to be replaced if they are the reason the check engine light came on.
Mercury Mariner QuestionsHad throttle position sensor changed but still hard to steer,what can I do next? (1 answer)
Transmission slips in in 2nd and 4th gear
i recently had my transmission rebuilt and when i got it back from the shop it was beeing and saying passanger door adjar. Even when its parked the alarm goes off randolmly
Changed the ignition switch on the left of the steering column feel it is the key mechanism itself or the keys. Problem occurs most of the time. Have been able to start but problem is getting worse.
Mercury Mariner RecallsFuel Delivery Module Leaks Fuel
The fuel delivery module (FDM) may crack and leak fuel. Dealers will replace the FDM flange with one that has a redesigned fuel supply port free of charge to resolve the concern.
For a vehicle that has had a remanufactured Ford automatic transmission installed, the shift lever bolt may be loose, allowing disengagement of the shift lever from the transmission. Dealers will inspect the transmission and either tighten the shift lever bolt or replace the shift lever assembly free of charge to resolve the concern.
The coolant pump for the hybrid system may fail, resulting in the hybrid system shutting down, and the vehicle losing power. Dealers will inspect and replace the original motor electronics coolant pump free of charge to correct the concern.