1999 Mercury Grand Marquis Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1999 Mercury Grand Marquis
Verified by mechanics, reported by drivers like you
Ask a mechanic in our community
Never overpay. Check prices with our estimator
1999 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.
1999 Mercury Grand Marquis Questionstransmission slipping only 1, 2 and reverse and park work (1 answer)
the outside temp is stuck on 127 degrees can it be fixed?
Compass reads 180 degrees out of phase. It tells me the direction behind me not the direction in front.