2006 Mercury Mountaineer Engine cooling Problems
- Complaints
- 43about this part
- Share
- 37%of 117 total for the year
- Median mileage
- 57,150miles
- Trend
- FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
NHTSA recorded 43 complaints about the engine cooling of the 2006 Mercury Mountaineer, 37% of the 117 complaints for this model year. Where a mileage was given, the median is 57,150 miles.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The radiator keeps leaking, first dealer said there was nothing wrong with the vehicle, I am always putting coolant in the vehicle. You can smell the coolant as soon as you open the hood. This has been an ongoing problem since I had 53,000 miles and now that I have 122,000 miles it is getting worse and has to be repaired again.”
NHTSA complaint #10551076, filed 2013-11, 53,000 miles“Leaky radiator was 1st detected by myself but mechanics were unable to determine the leak because anti-freeze was not visibly leaking but the resevoir was always empty. I was told it was a problem with my tires. The problem was not addressed by mechanics until they saw that the radiator could not hold coolant any longer. Now it has been identified as having a hole in the radiator.”
NHTSA complaint #10302488, filed 2010-01, 69,543 miles“My 2006 Mercury Mountaineer radiator needs replacing because it is busted. I only have an estimate of 65,000 miles on it. The part will cost me $285.00 not including the labor. This vehicle is only 4 years old how could a part like this already need replacing.”
NHTSA complaint #10378514, filed 2011-01, 65,000 miles“The radiator in the 2006 ford explorer/Mercury Mountaineer is a weak link in the vehicle. My radiator is leaking and I'm not the only one, I have found other complaints of this on other explorers and mountaineers of this year.”
NHTSA complaint #10321668, filed 2010-03, 54,175 miles“Cracked radiator with only 41,000 miles. Dealership indicated repair cost would be $1,000. When I questioned possible defect they said they had no recalls but also indicated they had just replaced another one last week. I called another dealership to check price they estimated $750 and also indicated they had to replace 2-3 in the last few months. Judging from this site and others this is a major defect with 2006 ford explorers and mountaineers. Why doesn't anyone hold the manufacturer accountable?”
NHTSA complaint #10303684, filed 2010-02, 41,500 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…
- 10029205Jun 1, 2009Ford/mercury/lincoln: vehicles may exhibit one or more of the following symptoms: drive away hesitation, loss of rpm on deceleration, difficulty starting, and/or idle rpm less…
- 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…
- 10021040Feb 26, 2007Calibration update 4.0l - various symptoms - surge, hesitation, torque converter cycling, no up shift after forced downshift, and poor a/c performance.
- 10020792Jan 16, 2007Diagnostic trouble codes (dtc) p0340, p0344, p0345, p0349. Are found.
- 10019911Apr 13, 2006The lower radiator hose clamps may develop cracks or break due to a concern with the clamp coating. Customer satisfaction program 06b38 - lower radiator hose clamp replacement…
- 10019010Jan 1, 2006Mil on with dtc p2004 through p2008, p151a, p2015, p202 - 4.6l 3v.
- 10018936Jan 1, 2005Coolant leak -- heater hose connections.
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 2006 Mercury Mountaineer
39 complaintsEngine
14 complaintsElectrical system
9 complaintsOther or unknown
9 complaintsBody and structure
7 complaintsSeats
6 complaintsFuel system
5 complaintsBrakes
3 complaintsVehicle speed control
3 complaintsEquipment
2 complaintsExterior lighting
2 complaintsTires
2 complaints
← All problems reported for the 2006 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