Mercury Mariner Hybrid Repair and Maintenance

A guide to problems, costs, maintenance and repair for your Mercury Mariner Hybrid

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Mercury Mariner Hybrid Problems

A/C Fan Speed Changing Constantly

The Mercury Mariner Hybrid 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.

Blower Motor Only Works on High

The 2008-2011 Mercury Mariner Hybrid 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.

Coolant Pump on Hybrid May Fail and Cause CEL/Engine Shutdown

The hybrid models have a coolant pump that cools control electronics. The pump can fail or spin slowly, which causes a Check Engine Light to illuminate and complete engine shut down.

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Mercury Mariner Hybrid Questions

Why is mariner hybrid all over the road in rain/snow after an accident i had? (2 answers)

Why is my 07 mariner hybrid all over the road in rain/snow after an accident i had? I hit a guard rail a few weeks ago and had to change passenger side front tire, wheel, strutt, and tie-rod. It was a little loose afterwards (may have slightly bent a-frame) but nothing too drastic. Today when it...

What could be causing annoying noise that starts as soon as I start the engine (1 answer)

Sounds like chirping or tapping under the hood. It continues even after I turn off the engine and only stops when i open the door.

The rear battery cooling fan won't shut off..not even hot, why is it on? (1 answer)

This has never happened before.

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Mercury Mariner Hybrid Reviews

Monday, went to open the car, and neither remote would work. The touch pad on the door also would not work. Opened the door with the key, and the motor would start, but could not get out of park. None of the digital/electronic displays worked. Windows nor locks would work. Air conditioner and cruise did. I was able to drive the car by disabling the "Park/Transmission" lock switch. The de...
The break issue posted above is caused by a faulty speed sensor in the cruise control. Mine was under warranty, but it took them maybe 30 minutes. I had this, and the real tailgate release break. Otherwise no tires, no repairs nothing for 110K miles. It is a great car.
My 2008 Mariner 2WD had to have the computer replaced at about 38,000 miles. It's failure caused the car to quit running on the highway, very dangerious. The good news was the hybrid feature allowed me to get to a dealer and it was covered by the 60,000 mile powertrain warrenty. Now at 59,000 mile the AC compressor failed and had to be replaced (not warrenteed) to the tune of $1,100.00. I a...

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