2005 Mercury Mountaineer Engine cooling Problems
- Complaints
- 5about this part
- Share
- 6%of 82 total for the year
- Median mileage
- 34,177miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 5 complaints about the engine cooling of the 2005 Mercury Mountaineer, 6% of the 82 complaints for this model year. Where a mileage was given, the median is 34,177 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.
“My Mountaineer stalls without warning while going about 35 MPH but after a few minutes can restart. It has done this 4 times over the last 3 or so months. In addition twice it would not start (it had been about 30 minutes since I drove it) and it had to be jumped. I replaced the battery thinking that was the problem but it persists. I brought it to a regular garage once, who kept it for a day and found nothing wrong. I then brought it to a Mercury dealer who kept it for 2 days but found no codes or problems. …”
NHTSA complaint #10343823, filed 2010-07, 73,000 miles“Without warning of any kind the engine quits under 35 MPH, sometimes with cruise control on. After car rolls to a stop, it can restart right away. Loss of power steering and brakes. Dealer says no codes to back up complaint. This has as happened at least 3x spread over 35,000 odometer miles.”
NHTSA complaint #10274542, filed 2009-06, 35,000 miles“- the contact owns a 2005 Mercury Mountaineer. On 11/20/06 the contact's heater on/off switch wouldn't allow her to turn the heater off. The contact had to drive with the windows rolled down. The contact also attempted to turn the vehicle off and restart and the failure continued to occur. While driving on 12/18/06 at 35mph the engine stalled and the vehicle shut off. The warning indicator light read check engine, low pressure prior to the failure. The failure also occurred on 1/19/07. Each time the failure occurred the contact was using the cruise control. …”
NHTSA complaint #10181889, filed 2007-02, 30,000 miles“The contact owns a 2005 Mercury Mountaineer. While driving 35 MPH, the vehicle stalled and the engine shut off. This has occurred three times since 2006. The failure is most common while driving down an incline and when the cruise control was activated. The check engine light was illuminated and the power steering does not operate normally. The vehicle restarted after ten to fifteen minutes. The failures occurred on december 18, 2006, january 19, 2007, and december 4, 2007. …”
NHTSA complaint #10211539, filed 2007-12, 12,327 miles“The contact owns a 2005 Mercury Mountaineer. On the day the vehicle was purchased, the contact noticed fluid leaking onto her garage floor. She returned to the dealer and was informed that the pinion seal needed to be replaced, and repairs were made. While traveling 45 MPH, the contact attempted to set the cruise control and the vehicle shut off in the middle of the road. She was able to pull over to the shoulder and restart the vehicle to drive home. After work one evening, she was unable to start the vehicle. After 20 minutes, her father arrived and was able to forcefully start the vehicle. …”
NHTSA complaint #10231347, filed 2008-06, 34,177 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…
- 10023943Oct 1, 2007Some 1997-2008 vehicles equipped with a 4.6l 2v, 5.4l 2v, or 6.8l 2v engine--spark plug thread repair procedure--not covered under new vehicle limited warranty. *nj this includes…
- 10018745Nov 14, 2005Wds cop kit diagnostic tip - coil on plug (cop) ignition systems - engine misfire or rough running.
- 10017931Jun 7, 2005No start/hard start on cold soak - 4.0l engine.
- 10017882Apr 1, 2005No start/hard start on cold soak.
- 10012953Feb 21, 2005Mil on and/ or runs rough/misfire dtcs p0300-p0308 p0316 and or p0171/p0174 4.6l engine.
- 10012947Feb 21, 2005Maf diagnostic service tip - vehicles equipped with egr system module (esm).
- 10013399Dec 31, 2004Throttle pedal response on tip in vehicles built before 10/4/2004 equipped with a 4.0l engine.
- 10013383Nov 1, 2004Rough idle in drive.
- 10011162Aug 23, 2004Engine misfire or running - coil on plug (cop) ignition systems - wds cop kit diagnostic tips. To include various 2005 models. * ar this article 04161 supersedes tsb 03-14-04.
Engine cooling: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2008 | 3 | 3% |
| 2007 | 4 | 5% |
| 2006 | 43 | 37% |
| 2005 | 5 | 6% |
| 2004 | 11 | 5% |
| 2003 | 10 | 7% |
| 2002 | 33 | 9% |
| 2001 | 1 | 5% |
| 2000 | 5 | 4% |
| 1999 | 12 | 8% |
| 1998 | 20 | 8% |
| 1997 | 14 | 4% |
Other parts of the 2005 Mercury Mountaineer
26 complaintsTransmission and drivetrain
19 complaintsVehicle speed control
13 complaintsEngine
7 complaintsBrakes
5 complaintsElectrical system
5 complaintsSteering
5 complaintsOther or unknown
4 complaintsVisibility (wipers, defrost, mirrors)
4 complaintsAir bags
3 complaintsFuel system
3 complaintsEquipment
2 complaints
← All problems reported for the 2005 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