1998 Mercury Grand Marquis Engine cooling Problems
- Complaints
- 26about this part
- Share
- 18%of 143 total for the year
- Median mileage
- 100,000miles
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
NHTSA recorded 26 complaints about the engine cooling of the 1998 Mercury Grand Marquis, 18% of the 143 complaints for this model year. Where a mileage was given, the median is 100,000 miles. 2 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The plastic intake manifold in my 1998 Grand Marquis has cracked resulting in engine coolant fluid leak and engine failure. It is being repaired today. The car has approximately 87,000 miles. I understand that this occurs because of the material used for the intake manifold. The car is in otherwise very good condition.”
NHTSA complaint #10307810, filed 2010-02, 88,000 miles“Plastic intake manifold cracked and leaking coolant around thermostat area that squirts out under driving conditions and pools around fuel injection and contaminates electronics and serpentine belt and pulleys. Could leak to overheating and engine failure . Poor driving condition.”
NHTSA complaint #10189290, filed 2007-04, 121,000 miles“The contact owns a 1998 Mercury Grand Marquis. Whenever the contact turned the vehicle on he noticed that the check engine light would appear on the dashboard. While examining the engine he also noticed that anti-freeze was leaking onto the engine. The vehicle has not been diagnosed by the dealer. The failure mileage was 100,000.”
NHTSA complaint #10294722, filed 2009-12, 100,000 miles“The contact owns a 1998 Mercury Grand Marquis. The contact stated that the vehicle would overheat abnormally. The vehicle was taken to a local repair shop where the radiator was flushed but to no avail. The contact later inspected the vehicle and discovered that the intake manifold was fractured. The contact believed that the failure was caused because the intake manifold was designed using plastic. The vehicle was not repaired. The VIN was unavailable. The failure and current mileage was 64,950.”
NHTSA complaint #10384475, filed 2011-02, 64,950 miles“The contact owns a 1998 Mercury Grand Marquis. After driving 65 MPH, the contact noticed fuel leaking from the vehicle. She stated that the intake manifold cracked and she took the vehicle to the ford dealer. The dealer informed her that there was a recall on her vehicle, but they would not honor it because it was only good for seven years. She took the vehicle to an independent dealer and paid $850 for the repair. The VIN and engine size were unknown. The current and failure mileages were 113,000. …”
NHTSA complaint #10204322, filed 2007-09, 113,000 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…
- 10018959Dec 14, 2005Extended coverage program 05n04 - extended coverage for composite intake manifold. This program is being provided as a settlement to a class action lawsuit. The terms of the…
- 10018745Nov 14, 2005Wds cop kit diagnostic tip - coil on plug (cop) ignition systems - engine misfire or rough running.
- 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 1998 Mercury Grand Marquis
17 complaintsExterior lighting
16 complaintsSuspension
16 complaintsElectrical system
15 complaintsBody and structure
10 complaintsVehicle speed control
9 complaintsFuel system
8 complaintsTransmission and drivetrain
8 complaintsBrakes
7 complaintsTires
7 complaintsAir bags
4 complaintsVisibility (wipers, defrost, mirrors)
4 complaints
← All problems reported for the 1998 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