One problem related to windshield has been reported for the 2003 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mercury Grand Marquis based on all problems reported for the 2003 Grand Marquis.
While driving under raining conditions cruise control was not working. Instrument lights panel was off, and windshield worked intermittently. Dealer replaced two computers in the electrical system , but problem still occurring.