One problem related to automatic transmission cooler 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 contact stated while shifting from drive to park the gear locked in reverse and while driving at low speeds at night the headlights would not go from low beam to high beam. Additionally, the tires slowly deflate. The dealership was alerted. They repaired the gear column, headlight switch and suggested to check the tires weekly and add air.