2005 Mercury Montego Engine cooling Problems
- Complaints
- 7about this part
- Share
- 5%of 135 total for the year
- Median mileage
- 41,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 7 complaints about the engine cooling of the 2005 Mercury Montego, 5% of the 135 complaints for this model year. Where a mileage was given, the median is 41,000 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.
“Have a 2005 Mercury Montego,on many occasions the engine suddenly surges and the RPM increase. This is dangerous and I quickly have to stomp on the brakes. Happens in both. Drive and reverse. Afraid I will hit someone or something when I pull out of a parking space. Have brought car to dealer 3 times and they say they cannot replicate and checked computer codes and found nothing wrong this is an accident waiting to happen.”
NHTSA complaint #10411477, filed 2011-07, 80,000 miles“Car showed failsafe engine mode on the display panel and did not respond when I hit the gas almost causing an accident as I attempted to change lanes. Engine response was intermittent after this and then the wrench symbol showed up. I pulled into a gas station and turned off the car to try and look at the owner's manual to see what this meant. Could not find details. Turned the car back on and the wrench was gone and the failsafe engine mode display was no longer showing. Worried this may happen again...”
NHTSA complaint #10310769, filed 2010-02, 55,000 miles“My 2005 Mercury Montego (79,000mi.) has unexpectedly lurched on two occasions. The first time I was driving slowly in a parking lot, and the car suddenly accelerated and lunged forward. Braking helped, but the lunging occurred again each time I tried to drive forward. I was able to move into a parking space and turn the car off which stopped the lurching movement. I sat for several minutes, restarted the car and drove away without incident. This didn't happen again for several months until a similar occurrence yesterday. …”
NHTSA complaint #10357637, filed 2010-09, 79,000 miles“While idling when stopped or when moving slowly, the engine speed suddenly accelerates to above 3500 RPM causing the car to lurch forward unless the brake is firmly applied. The sudden acceleration lasts 3 to 5 seconds. Placing the gear into neutral has no effect on the engine speed. This happens sporadically. In the last 3 months it has happened approximately 7 times. Dealer says the car's computer system reports nothing unusual.”
NHTSA complaint #10310294, filed 2010-02, 27,000 miles“Purchased vehicle in jan.05 seat belt replaced in jan transmission replaced in feb. 05 and a valve replaced due to check engine warning fuel pump replaced in aug.05, now have trouble starting car”
NHTSA complaint #10133582, filed 2005-08, 423 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…
- 10022241Apr 1, 2007Mil with dtc p0106 and/or p0109.
- 10018745Nov 14, 2005Wds cop kit diagnostic tip - coil on plug (cop) ignition systems - engine misfire or rough running.
- 10018066Oct 7, 2005Engine rpm fluctuation at highway cruising speeds - vehicles built prior to 8/2/2005.
- 10012947Feb 21, 2005Maf diagnostic service tip - vehicles equipped with egr system module (esm).
- 10012976Feb 1, 2005Vehicle may exhibit an oil life xx% message inthe odometer message center display prior to the vehicle reaching 5000 miles.
Engine cooling: other model years
Other parts of the 2005 Mercury Montego
49 complaintsElectrical system
27 complaintsVehicle speed control
24 complaintsBrakes
18 complaintsFuel system
12 complaintsEngine
10 complaintsBody and structure
10 complaintsOther or unknown
6 complaintsAir bags
5 complaintsExterior lighting
3 complaintsLatches, locks and linkages
3 complaintsSeat belts
2 complaints
← All problems reported for the 2005 Mercury Montego
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 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