1998 Mercury Grand Marquis Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1998 Mercury Grand Marquis
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1998 Mercury Grand Marquis ProblemsIntake Manifold May Crack Leaking Coolant Behind the Alternator
The composite (plastic) intake manifold may crack near the thermostat housing and cause a coolant leak. Ford released an updated manifold that was reinforced to prevent a recurrence. No recall was issued for this problem but Ford did extend the warranty to seven years on some models from the date of purchase.
The engine may overheat at idle when the AC is on. A new, upgraded fan motor and resistor may be required to correct this concern.
Transmission problems are common in this model, often as a result of a failed front pump. The pump loses its ability to create hydraulic pressure, which an automatic transmission needs to function. A sign of front pump failure can be a whine type noise.
1998 Mercury Grand Marquis Questionswhy does not engine check light stay on (1 answer)
my check engine light came on; I replaced gas cap (vapor link?); after some time being on, one day it goes off; the other day it comes back on; it has oil; car runs fine, no performance issues
When I start the car, the blower kicks on immediately and won't turn off, even if temp controls are off. I can adjust speed of fan, switch from heat to cool, etc... the blower just stays on.