Automatic transmission: cooling unit and lines
Risk. IF LEAKING TRANSMISSION FLUID CONTACTS THE CATALYTIC CONVERTER, IT MAY POSE A RISK OF FIRE.
NHTSA has logged 96 owner complaints about the 2008 Mercury Mountaineer, most often about the seats. It is covered by 1 safety recall.

Source: NHTSA complaints, recalls, investigations and manufacturer recall reports, through September 3, 2025. Updated daily. Photo: IFCAR, Public domain.
96 complaints grouped by the system owners reported.
| System | Complaints | Crash, fire or injury |
|---|---|---|
| Seats | 54 | 1 |
| Electrical system | 39 | 2 |
| Power train | 9 | 1 |
| Engine | 6 | 0 |
| Exterior lighting | 6 | 0 |
| Seat belts | 4 | 0 |
| Interior lighting | 4 | 0 |
| Structure | 3 | 0 |
| Steering | 3 | 0 |
| 14 other systems | 22 | 0 |
Source: NHTSA Office of Defects Investigation. Complaints are submitted by the public and are not verified by NHTSA.
Each ring shows the share of affected cars repaired, from the manufacturer’s latest quarterly report to NHTSA. Recall repairs are free at authorized dealers.
Risk. IF LEAKING TRANSMISSION FLUID CONTACTS THE CATALYTIC CONVERTER, IT MAY POSE A RISK OF FIRE.
Recalls apply to specific cars. To see whether a recall is still open on yours, enter the 17-character VIN at nhtsa.gov/recalls or with Mercury.
65kmiles, median
Based on the odometer reading in 49 seats complaints. 84% were reported before 100,000 miles.
Bars show complaints per model year. Colors show the CarFlaw verdict: complaints weighted for crashes, fires and injuries, adjusted for years on the road and compared with the Mountaineer median. How we score
2008 Mercury Mountaineer 4-DR. w/SAB in NHTSA's New Car Assessment Program. Photos are from NHTSA's crash tests.
Federal investigations that included the 2008 Mercury Mountaineer, and the recalls they led to.
Recent seats complaints filed with NHTSA, shortened. Personal details are removed.
DRIVER SEAT ELECTRICAL ADJUSTMENT WILL MOVE ITSELF BACKWARDS WHILE CAR IS MOVING. THERE IS NO PATTERN TO THIS PROBLEM, IT IS RANDOM.
WHEN I AM DRIVING THE CAR THE SEAT WILL MOVE BACK ON IT'S OWN VOLITION INTO EXIT POSITION. THIS HAPPENS WHEN IT GOES OVER A BUMP OR IF THE KEY IS JIGGLED IN THE IGNITION. IT HAPPENED IN MULTIPLE SITUATIONS LAST WEEK. VERY FRIGHTENING AS I HAVE TO SCRAMBLE TO REACH THE BRAKE AND ALSO MOVE THE SEAT…
WHILE DRIVING THE VEHICLE THE INTERIOR LIGHT TURNS ON AND THE SEAT MOVES BACK INTO THE PARK POSITION. THIS IS A SAFETY ISSUE AS IT IS DIFFICULT TO REACH THE PEDAL/BRAKE AND IT HAPPENS WITHOUT NOTICE. THERE IS NO RHYME OR REASON TO THIS PROBLEM. I HAVE SEEN MULTIPLE POSTS REGARDING THIS ISSUE AND…
Decode your VIN to see the recalls for your exact car, then confirm open recalls with NHTSA.