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.
Problems for specific Mercury Grand Marquis years:
Car problem reports
Problem with your car? See what our experts say or submit your own.
Most reported 1997 Mercury Grand Marquis problems