Problems · by component

1998 Mercury Grand Marquis engine and engine cooling problems

31 owner complaints to NHTSA about the 1998 Mercury Grand Marquis cite engine and engine cooling, 18% of all 177 complaints for this model year.

Complaints
31
18% of all complaints
Crashes
0
Reported by owners
Fires
2
Reported by owners
Injuries
1
Reported by owners
01 —Owner reports

What owners say about the engine and engine cooling

Verbatim from NHTSA complaints, newest first
“TL*THE CONTACT OWNS A 1998 MERCURY MARQUIS. THE CONTACT STATED THAT WHILE DRIVING AT 40 MPH, THERE WAS SMOKE COMING FROM THE HOOD OF THE VEHICLE. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC, WHO DIAGNOSED THAT THE MANIFOLD AND THE THERMOSTAT HOLDER NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE VIN WAS NOT AVAILABLE. THE APPROXIMATE FAILURE MILEAGE WAS 130,000. UPDATED 3/24/15*CN THE CONSUMER STATED HE PULLED THE VEHICLE TO THE CURB, INSPECTED THE ENGINE AND NOTICED SMOKE COMING FROM A BROKEN PART, RELEASING ANTI-FREEZE. THE THERMOSTAT GASKET HOUSING AND INTAKE MANIFOLD WERE REPLACED. UPDATED 07/07/15*JB”
Owner complaint to NHTSAFiled Jan 29, 2015Engine and engine cooling, EngineODI 10679678
“TL* 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.”
Owner complaint to NHTSAFiled Feb 25, 2011Engine and engine coolingODI 10384475
“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. *TR”
Owner complaint to NHTSAFiled Feb 9, 2010Engine and engine coolingODI 10307810
“TL*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.”
Owner complaint to NHTSAFiled Dec 7, 2009Engine and engine coolingODI 10294722
“TL*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. UPDATED 12/12/2007 *BF THE CONSUMER STATED THE INTAKE MANIFOLD WAS A DEFECT THAT FORD REFUSED TO PAY FOR THE REPAIRS. THE CONSUMER STATED WOULD LIKE TO BE REIMBURSED FOR REPAIRS. UPDATED 12/12/07 *TR”
Owner complaint to NHTSAFiled Sep 27, 2007Engine and engine coolingODI 10204322
“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. *AK”
Owner complaint to NHTSAFiled Apr 30, 2007Engine and engine coolingODI 10189290

Showing 6 of 31 reports. Read every report on NHTSA.gov.

Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 9, 2026NHTSA vehicle page

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.