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EnginePart report

2007 Mercury Mountaineer Engine Problems

Complaints
5about this part
Share
6%of 81 total for the year
Median mileage
85,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 5 complaints about the engine of the 2007 Mercury Mountaineer, 6% of the 81 complaints for this model year. Where a mileage was given, the median is 85,000 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“A repair shop told me that my engine was leaking coolant that could make the engine run hot and fail. After doing some online research, I found that this is a common problem with these vehicles as ford used a cheap plastic part which easily cracks and allows coolant to leak. The leak also affects other parts of the engine cause them to perform improperly. Ford is aware of this problem but has failed to issue a recall despite their knowledge and the risks to the consumer.”

NHTSA complaint #10762456, filed 2015-09, 121,000 miles

“Car ran rough & hesitated/surged upon acceleration. Apparently this is a common ford problem involving premature spark plug break down in the ford triton engine see ford spark plug class action settlement. Shultz ford in nanuet ny diagnosed the problem as faulty plugs, there was also a risk of breaking plugs upon removal. I had them do the repairs at a cost of $788. Later I found that there was a settlement, however my car was not included even though it had the same engine as the cars/trucks/ SUV's that were included in the settlement. …”

NHTSA complaint #11123073, filed 2018-08, 80,000 miles

“I was driving on the highway and noticed that my steering was not working well. My engine was overheating and eventually shut off. I had to pull over on the side of the highway. When I got someone to look at the car, we realized it had no coolant. We filled up the coolant and everything seemed fine. About a month later I noticed that the engine was making the same noise as it had before as if it were working too hard. I checked the coolant and it was completely empty again. I have a friend who also owns the mm and had the same problem. The repair and cost of a new radiator was 1500. …”

NHTSA complaint #10472722, filed 2012-08, 60,000 miles

“The contact owns a 2007 Mercury Mountaineer. The contact stated while driving 40 MPH the vehicle stalled without warning. The vehicle was towed to the dealer for inspection and they stated that the engine overheated and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 90,000. The VIN was unavailable.”

NHTSA complaint #10576197, filed 2014-04, 90,000 miles

Related service bulletins

Engine: other model years

YearComplaintsShare of year
2010323%
200866%
200756%
20061412%
200579%
200484%
200311%
200221%
200115%
200043%
199821%

Other parts of the 2007 Mercury Mountaineer

Seats
26 complaints
Transmission and drivetrain
25 complaints
Electrical system
16 complaints
Vehicle speed control
7 complaints
Other or unknown
6 complaints
Steering
5 complaints
Body and structure
5 complaints
Engine cooling
4 complaints
Seat belts
3 complaints
Visibility (wipers, defrost, mirrors)
3 complaints
Wheels
3 complaints
Exterior lighting
2 complaints

← All problems reported for the 2007 Mercury Mountaineer

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology