2005 Mercury Grand Marquis Engine cooling Problems
- Complaints
- 9about this part
- Share
- 2%of 488 total for the year
- Median mileage
- 20,194miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 9 complaints about the engine cooling of the 2005 Mercury Grand Marquis, 2% of the 488 complaints for this model year. Where a mileage was given, the median is 20,194 miles. 2 of these say a crash was involved, according to the filers.
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.
“On three occasions when shifting from park to reverse the engine sped up (accelerated drastically) causing the wheels to spin and only by quick application of the brake was an incident avoided. I drove into a parking space, put the car in park, then not satisfied with the position I attempted to back up, that's when the car accelerated.”
NHTSA complaint #10146592, filed 2005-12, 8,100 miles“Knocking noise from engine/transmission area when car is stopped at idle, transmission in gear, windows closed and heater fan off. Problem: intermittent, erratic, muffled knocking noise. Heard from inside the car.”
NHTSA complaint #10160982, filed 2006-06, 10 miles“Rough engine idle, dealer reps say all the new ones do it , it's normal . I have asked them about it on several occasions since purchasing the car. My 2005 marquis does not get nearly the good gas mileage the 2001 marquis did with the same engine. The dealer told me you can't compare cars .”
NHTSA complaint #10145755, filed 2005-12“Rough engine idle, dealer reps say 'all the new ones do it', 'it's normal'. I've asked them about it on several occasions since purchasing the car. Not nearly as good gas mileage as our 2001 Grand Marquis got, was told by the dealer, you can't compare cars'.”
NHTSA complaint #10145595, filed 2005-12“The contact owns a 2005 Mercury Grand Marquis. While driving at an unknown speed, the plastic cover of the intake manifold fractured and leaked water all over the yard without warning. The dealer was not called. The manufacturer was made aware of the failure and informed the contact to call NHTSA. The failure was not repaired. The failure mileage was approximately 115,000.”
NHTSA complaint #11161193, filed 2018-12, 115,000 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…
- 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…
- 10018745Nov 14, 2005Wds cop kit diagnostic tip - coil on plug (cop) ignition systems - engine misfire or rough running.
- 10012947Feb 21, 2005Maf diagnostic service tip - vehicles equipped with egr system module (esm).
- 10012940Feb 7, 2005Idle vibration vehicles equipped with single exhaust.
- 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 |
|---|---|---|
| 2010 | 1 | 4% |
| 2008 | 5 | 6% |
| 2007 | 3 | 3% |
| 2006 | 2 | 1% |
| 2005 | 9 | 2% |
| 2004 | 10 | 3% |
| 2003 | 13 | 4% |
| 2002 | 10 | 13% |
| 2001 | 20 | 13% |
| 2000 | 17 | 10% |
| 1999 | 26 | 16% |
| 1998 | 26 | 18% |
| 1997 | 124 | 39% |
| 1996 | 85 | 36% |
| 1995 | 8 | 4% |
| 1994 | 15 | 10% |
| 1993 | 7 | 5% |
| 1992 | 19 | 7% |
| 1991 | 10 | 12% |
| 1990 | 3 | 5% |
| 1989 | 6 | 10% |
| 1988 | 7 | 10% |
| 1987 | 5 | 12% |
| 1986 | 4 | 19% |
| 1985 | 3 | 14% |
| 1984 | 5 | 33% |
Other parts of the 2005 Mercury Grand Marquis
293 complaintsElectrical system
75 complaintsAir bags
67 complaintsVehicle speed control
39 complaintsSeat belts
36 complaintsSteering
20 complaintsBrakes
18 complaintsBody and structure
11 complaintsVisibility (wipers, defrost, mirrors)
11 complaintsOther or unknown
10 complaintsTires
8 complaintsEngine
5 complaints
← All problems reported for the 2005 Mercury Grand Marquis
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