Remove the black plastic piece that holds the courtesy light under the dash. There are 2 screws that hold the LCM to the bracket. The LCM is just above and in front the diagnostic Data Link for those who want to know. You can reach up and press the wiring harness connector clips and pull the connectors to the front of the car. Then release the plastic latch on the underside of he LCM.
Move the LCM forward and turn it up and sideways and it will clear everything. It is tight, but it will clear. I have changed about 5 of these this way, all on 2003 MM and CV's.
It seems 03's lose the headlight relay and make the headlights cycle on/off when it gets hot outside or the heater is on full blast (at least out here in the desert). Good luck.
headlight relay location on a 2004 mercury grand marquis
Take it to a repair shop.
how do i replace a passenger side headlamp for a 2004 grand marquis gs
2004 mercury grand marquis fan stop working
According to the 2004 Mercury Grand Marquis Owner Guide : ( 19.0 US. gallons )
On a 2004 Mercury Grand Marquis : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
According to the 2004 Mercury Grand Marquis Owner Guide : ( " regular " unleaded gasoline , 87 octane )
According to the 2004 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts of 5W-20 )
Just had my 2004 grand marquis convertor replaced (making an aweful noise). it cost me $250 for the part and then labor etc. total of bill for installing etc was $472.61.
According to the 2004 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6 quarts )
The cabin air filter, in your 2004 Mercury grand Marquis, is located behind the dashboard on the passenger side. The air filter is directly behind the glove compartment.
According to the 2004 Mercury Grand Marquis Owner Guide : The engine cooling system capacity is ( 18 liters / 19 U.S. quarts ) It came from the factory with a 50 / 50 mix of antifreeze and distilled water