One problem related to radiator has been reported for the 1998 Mercury Grand Marquis. The most recently reported issues are listed below.
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.