Problem overview
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.
29 people reported this problem
7 commentsMercury Mariner vehicles with this problem
Average mileage: 94,225 miles
(48,127 - 137,000)
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