Mercury Grand Marquis Engine and Engine Cooling Problems
Owners have filed 359 complaints with NHTSA about engine and engine cooling problems on the Mercury Grand Marquis across 15 model years. The 1997 model year has the most (124). The words owners use most often: “intake manifold” (51% of reports).
- 359engine and engine cooling complaints
- —median miles at failure
- 6mention a crash
- 8mention an injury
- 0related recalls
- $1,400typical repair cost reported by owners
- 52%of reports with a speed happened at 50+ mph
What owners describe
Phrases that appear unusually often in these complaints compared with complaints about other cars.
- Intake manifold: mentioned in 184 of 359 complaints (51%)
How much does it cost to fix?
Owners who wrote down what they paid or were quoted put the typical engine and engine cooling repair on the Mercury Grand Marquis at $1,400, and half of them between $1,000 and $1,850.
Based on 46 NHTSA complaints about this problem alone that state a repair bill or quote (2002–2011), converted to 2026 dollars with the U.S. consumer price index. These are owners' own figures, not a quote: they include dealer quotes, and owners who file complaints often faced larger repairs, so they can run higher than typical shop prices. Prices vary by shop, region and warranty coverage. How we calculate this.
At what mileage do engine and engine cooling problems happen?
Based on 227 complaints that reported the odometer reading.
How serious are the reports?
Of 359 complaints, 6 mention a crash, 18 a fire, 8 an injury.
Mercury Grand Marquis engine and engine cooling complaints by model year
| Model year | Engine and Engine Cooling complaints | Share of that year | Median miles |
|---|---|---|---|
| 2010 Grand Marquis | 1 | 4% | 36,000 |
| 2008 Grand Marquis | 5 | 6% | 19,800 |
| 2007 Grand Marquis | 3 | 3% | 3,001 |
| 2006 Grand Marquis | 2 | 1% | 99,300 |
| 2005 Grand Marquis | 9 | 2% | 20,194 |
| 2004 Grand Marquis | 10 | 3% | 100,000 |
| 2003 Grand Marquis | 13 | 4% | 18,445 |
| 2002 Grand Marquis | 10 | 13% | 73,000 |
| 2001 Grand Marquis | 20 | 13% | 36,000 |
| 2000 Grand Marquis | 17 | 10% | 87,000 |
| 1999 Grand Marquis | 26 | 16% | 92,100 |
| 1998 Grand Marquis | 26 | 18% | 100,000 |
| 1997 Grand Marquis | 124 | 39% | 80,072 |
| 1996 Grand Marquis | 85 | 36% | 85,000 |
| 1995 Grand Marquis | 8 | 4% | 76,583 |
When owners reported it
Related recalls (0)
No safety recall lists engine and engine cooling for the Mercury Grand Marquis. A pattern of complaints does not always lead to a recall.
What owners report
Short excerpts of recent complaints, with personal details removed. Full reports are on NHTSA.gov.
The contact owns a 2001 Mercury Grand Marquis. The contact stated he noticed coolant fluid on the ground underneath the vehicle. The contact started the vehicle and noticed that the high engine temperate warning light was illuminated. The dealer was contacted but was not able to diagnose the…
The contact owns a 1999 Mercury Grand Marquis. The contact stated that the vehicle had a leaking intake manifold. The vehicle was taken to an independent mechanic and diagnosed that the intake manifold needed to be replaced. The vehicle was not repaired. The dealer and manufacturer were made aware…
The contact owns a 2004 Mercury Grand Marquis. The contact stated that she noticed a leak underneath her vehicle with the check engine and coolant warning lights illuminated. The contact had taken the vehicle to an independent mechanic where it was discovered that coolant had been leaking from a…
Tl* 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…
Tl* the contact owns a 2002 mercury grand marquis. The contact stated that there was a premature failure in which there was an internal crack on the intake manifold, which caused water intrusion that affected other components. The vehicle was not diagnosed or repaired. The manufacturer was notified…
Frequently asked questions
Do all Mercury Grand Marquiss have engine and engine cooling problems?
No. NHTSA has 359 owner complaints about engine and engine cooling for the Mercury Grand Marquis. Complaint data shows that the problem is reported, not how many of all cars sold are affected.
Was there a recall on the Mercury Grand Marquis engine and engine cooling?
No recall currently lists engine and engine cooling for this vehicle.
How much does it cost to fix engine and engine cooling problems on the Mercury Grand Marquis?
Owners report a typical cost of $1,400 (half paid between $1,000 and $1,850), from 46 complaints that state a repair bill or quote, in 2026 dollars.
What do owners say about engine and engine cooling problems on the Mercury Grand Marquis?
The most frequent phrase is “intake manifold”, in 184 of 359 complaints.
Other Mercury Grand Marquis problems
- Exterior Lighting problems (853)
- Electrical System problems (312)
- Steering problems (309)
- Vehicle Speed Control problems (305)
- Air Bags problems (189)
- Service Brakes, Hydraulic problems (172)
- Suspension problems (166)
- Seat Belts problems (136)
See all Mercury Grand Marquis problems.