One problem related to windshield has been reported for the 2004 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mercury Grand Marquis based on all problems reported for the 2004 Grand Marquis.
The "actuator" that allow hot air to flow into the car for heat malfunctions and will not move. You can not defrost the windshield resulting in zero visibility while driving in the cold.
| Wiper problems | |
| Windshield Wiper/washer problems | |
| Windshield problems | |
| Windshield Wiper/washer Motor problems |