how to take the door panel off of a 1997 mercury marquis
Take it to a repair shop.
A grand marquis wiring diagram can be found in a Chiltons or Haynes auto repair manual.
Replace the hose.
Try Autozone.com - they very likely have an on-line illustrated repair guide for the '93 Grand Marquis.
The repair section on autozone.com explains how to change the light switch.
According to my Chilton's Auto Repair manual : A 1988 Mercury Grand Marquis has a ( 20 U.S. gallon ) gas tank
If you are wondering if there are any auto mechanics who can repair your bumper because your bumper is broken, then the answer is yes. There auto mechanics that can repair your bumper.
The stereo wiring diagram for a 1988 Mercury Grand Marquis is available from a factory service repair manual. These manuals can be found online and PDF. format.
According to my Chilton's Auto Repair manual : A ( 1987 ) Mercury Grand Marquis has a ( 20 U.S. gallon gas tank )
Need to know what's wrong with it. More info please.
According to my Chilton's Auto Repair manual : For a 1989 Mercury Grand Marquis : With engine oil filter change : Both the 5.0 / 302 and the 5.8 / 351 take ( 5.0 U.S. quarts )