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Engine coolingPart report

2007 Mercury Mariner Hybrid Engine cooling Problems

Complaints
6about this part
Share
19%of 31 total for the year
Median mileage
61,840miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 6 complaints about the engine cooling of the 2007 Mercury Mariner Hybrid, 19% of the 31 complaints for this model year. Where a mileage was given, the median is 61,840 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.

“While I was driving my 2007 Mercury Mariner Hybrid at 65 MPH on a highway, the red triangle came on and the message stop safely now. The car completely and suddenly lost all power. I tried to give it some gas but to no avail. I pulled over, shut it off for a few minutes, and then was able to restart it and make it home. I have 64,000 miles on the car. I see that there are service bulletins describing this problem, but am upset that I was not informed about it, especially since the warranty goes to 60,000 miles.”

NHTSA complaint #10342552, filed 2010-07, 64,680 miles

“I own a 2007 Mercury Mariner Hybrid and I was traveling from virginia where I previously lived to new york for a job interview. While traveling on the new jersey turnpike at a speed of around 73 miles per hour a light came on in my vehicle that stated stop vehicle safely. I was traveling in the furthest left hand lane of 4 at the time and within about 2 or 3 seconds of this light coming on I lost gas engine power to my vehicle. I was honestly scared for my life because the only portion of my vehicle that was working is the electric engine that allows the vehicle to go around 25 miles per hour. …”

NHTSA complaint #10449239, filed 2012-02, 68,120 miles

“Was driving - when stop safely now message appeared on display, engine had shut off, pulled over, waited a minute, restarted engine, drove a couple of blocks, stop safely now message reappeared, did this several times in the few miles to home. Took car to dealer next morning. Replaced the cooling system pump.”

NHTSA complaint #10464204, filed 2012-07, 52,284 miles

“Car engine sudden went dead in the middle of highway and message appeared that pull over now for safety. No power to wheels ect. Barely found safe place to pull over. Dealership said it was caused by leaky water pump. Vehicle was repaired at folsom lake ford. No note was on the display saying water pump, just the above message. Had to wait and restart engine. This could have caused a serious accident in high speed traffic on a freeway, ect.”

NHTSA complaint #10507344, filed 2013-04, 59,000 miles

“Engine shuts off without any forewarning while vehicle is in motion. Dealer has attempted to repair the problem 2 times--problem persists. They say it is a problem with the cooling system for the hybrid batteries. They have replaced a wiring harness and the motor of the cooling fan.”

NHTSA complaint #10329183, filed 2010-05, 65,000 miles

Related service bulletins

Engine cooling: other model years

YearComplaintsShare of year
20081311%
2007619%
200613%

Other parts of the 2007 Mercury Mariner Hybrid

Brakes
8 complaintsElectrical system
4 complaintsEngine
4 complaintsHybrid propulsion system
3 complaintsOther or unknown
3 complaintsTransmission and drivetrain
3 complaintsFuel system
2 complaintsSteering
2 complaintsBody and structure
2 complaintsEquipment
1 complaintsSeats
1 complaintsSuspension
1 complaints

← All problems reported for the 2007 Mercury Mariner Hybrid

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 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