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Engine coolingPart report

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 miles

Related service bulletins

Engine cooling: other model years

YearComplaintsShare of year
201014%
200856%
200733%
200621%
200592%
2004103%
2003134%
20021013%
20012013%
20001710%
19992616%
19982618%
199712439%
19968536%
199584%
19941510%
199375%
1992197%
19911012%
199035%
1989610%
1988710%
1987512%
1986419%
1985314%
1984533%

Other parts of the 1998 Mercury Grand Marquis

Steering
17 complaints
Exterior lighting
16 complaints
Suspension
16 complaints
Electrical system
15 complaints
Body and structure
10 complaints
Vehicle speed control
9 complaints
Fuel system
8 complaints
Transmission and drivetrain
8 complaints
Brakes
7 complaints
Tires
7 complaints
Air bags
4 complaints
Visibility (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