2009 Mercury Mariner Engine cooling Problems
- Complaints
- 7about this part
- Share
- 2%of 315 total for the year
- Median mileage
- 20,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 7 complaints about the engine cooling of the 2009 Mercury Mariner, 2% of the 315 complaints for this model year. Where a mileage was given, the median is 20,000 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.
“The vehicle stalls randomly. I may be driving or idling and the car stalls. It is easily started again by putting the car in neutral and turning the key. I have had ford look at it several times and they first changed the battery and then second changed the gas filter. The problem still exists.”
NHTSA complaint #10398549, filed 2011-05, 32,000 miles“My vehicle started leaking fluorescent oil from behind the radiator. Apparently, it's the condenser. I have been told that the radiator lines run through the same system, and that if it is not repaired my transmission will eventually fail. This failure was explained to be the transmission locking up, and they said if I'm going over about 30 MPH it will be very dangerous. I am about 2,000 miles out of warranty, and the emails I have sent to ford only get a response that they will be happy to take my money and fix it. …”
NHTSA complaint #10457399, filed 2012-05, 38,000 miles“Within the first months of owning the vehicle, it staled randomly. I could be driving or idling and the car stalls. Ifi put in neutral or park, it was easily re-started. I have had the dealer look at it several times the problem still exists. Nothing showed on the computer.on many occasions starting in 2010, the vehicle hesitates when shifting. When I would accelerate after coasting; w aiting for a light to turn green, trying to leave a stop light or sign, or after making a turn, there was a lull where the vehicle was unresponsive. It then kind of lurches into gear. …”
NHTSA complaint #10497586, filed 2013-02, 2,300 miles“Coming to red light one car in front of me. I pushed down on brake petal and it was hard to push down. Engine revved up to over 5 RPM's and car wouldn't stop finally I put car in neutral and engine went back to idle position. Almost rear ended car in front of me. Took Mariner to dealer who wasn't very helpful because he never heard of this before & wanted to know if I wanted to leave Mariner there. Also ask if I had my foot on the gas petal instead of the brake. Dealer was unable to verify concern so they replaced canister purge valve. …”
NHTSA complaint #10401772, filed 2011-05, 16,530 miles“The vehicle stalls randomly. I may be driving slowly or idling and the car stalls. This has happened at yield signs, red lights and going down hill. This is very dangerous. One time at a right signal arrow it stalled going up a slight incline and I almost got hit from the back. It is easily started again by putting the car in neutral and turning the key. I brought it to the dealer because the car wouldn't start and had to be jumped. They replace the battery and blamed the battery on the problem. It is still happening and I am bringing it again.”
NHTSA complaint #10435254, filed 2011-11, 20,000 milesRelated service bulletins
- 10109070Sep 21, 2016The Powertrain Control/Emissions Diagnosis (PC/ED) manual has been revised for diagnosing electronic throttle bodies (ETBs). The ETC_ACT and ETC_DSD PIDs should not used to…
- 10040948Mar 15, 2011Ford: there may be a leaking/stuck canister purge valve which can cause multiple driving systems. The malfunction light may be on with or without stored trouble codes.
- 10037561Feb 1, 2011Ford: vehicles may run rough, hard start after refueling, clicking noise under hood, and have trouble codes stored.
- 10037083Sep 17, 2010Ford: on various 2009-2010 models there may be a malfunction light on with five possible fault codes.
- 10037097Sep 7, 2010Ford: some hybrid vehicles may have a malfunction light on with two possible fault codes.
Engine cooling: other model years
Other parts of the 2009 Mercury Mariner
167 complaintsEngine
53 complaintsTransmission and drivetrain
44 complaintsVehicle speed control
41 complaintsFuel system
30 complaintsElectrical system
22 complaintsOther or unknown
15 complaintsBrakes
14 complaintsWheels
7 complaintsAir bags
4 complaintsElectronic stability control
4 complaintsBody and structure
3 complaints
← All problems reported for the 2009 Mercury Mariner
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 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