2003 Mercury Grand Marquis Engine cooling Problems
- Complaints
- 13about this part
- Share
- 4%of 362 total for the year
- Median mileage
- 18,445miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 13 complaints about the engine cooling of the 2003 Mercury Grand Marquis, 4% of the 362 complaints for this model year. Where a mileage was given, the median is 18,445 miles. 1 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.
“The plastic intake manifold of my 2003 Mercury 4.6l v-8 came apart and let the coolant leak out onto the engine.this car was built in canada in mid-2002 the problem is rampant in many years of the ford co cars. And in 2001 a class action suit was filed, in which ford was directed to pay damages to all owners (1,800,000 owners) of this type of engine and ford was supposed to stop installing that item as of then. Clearly they did not stop and that failure cost me over $1000.00 to repair. The repair part is now partly aluminum and part plastic. …”
NHTSA complaint #10306527, filed 2010-02, 114,000 miles“My wife was driving our 1997 Mercury marquis home in heavy traffic. Suddenly steam began pouring out from under the hood and the hot light went on. She pulled to the edge of the road and called me. I sent a tow truck to bring the car to our home. I looked and could see water all over the engine and perhaps a hose broken. Rather than tow it to the dealership, 20 miles away, I called a quality garage locally that I had dealt with before. They said the intake manifold was cracked, the water pump leaking as a minimum. The cost to replace and fix everything was $1075. …”
NHTSA complaint #10106570, filed 2005-01, 103,000 miles“2003 Mercury grand marques stalls at or near idle speed. Has stalled when backing up, when starting forward from stop at traffic light. Have had it into the dealer, ray pearman lincoln Mercury 4 time for a total of 9 days. They have been unable to fix problem as of yet. The dealer confirmed that there was a stalling problem. They have replaced the idle air control valve and the mass air flow sensor. Each time they thought they had it fixed and had me take the car, it has stalled again. One time it stalled as I was backing out of the dealer service department. …”
NHTSA complaint #10064268, filed 2004-03, 26,890 miles“Engine made a loud knocking sound. Vehicle was taken to the dealer several times since purchase. Dealer stated that there was no sound, nothing was done. Another outside mechanic told him it sounded like a bearing. Dealer stated that the right cylinder had to be replaced, and the vehicle was still at dealer.”
NHTSA complaint #10087364, filed 2004-08, 10,000 miles“2003 Grand Marquis developed problems with the alternator, the throttle sticking open and alignment problems. There was also a rattle noise coming from the engine and the digital readout on the dash was not reading properly.”
NHTSA complaint #10134487, filed 2005-08, 1,000 milesRelated service bulletins
- 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 2003 Mercury Grand Marquis
207 complaintsElectrical system
51 complaintsSteering
28 complaintsSuspension
28 complaintsVehicle speed control
27 complaintsTransmission and drivetrain
12 complaintsAir bags
11 complaintsFuel system
10 complaintsVisibility (wipers, defrost, mirrors)
10 complaintsWheels
10 complaintsBody and structure
9 complaintsBrakes
7 complaints
← All problems reported for the 2003 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