1994 Mercury Grand Marquis temp gauge reads hot

SOURCE: rear shocks on a 1996 Mercury Grand Marquis

2 bolts on the top of shocks and 1 bolt on the bottom but the top 2 bolts are a pain in the neck

SOURCE: 1994 Mercury Grand Marquis Check Engine Light Code 332

its the tube going from the egr valve to your exhaust it have carbon build up and you either have to replace it or get a metal coat hanger and clean it out.

SOURCE: The heater in our car is not blowing hot air. It

Check the heater hoses under the hood first to see if they are hot. if they are, there is a temperature control actuator on the top of the heater box. the motors go bad, and the temp door does not move. The motor is hard to get to but if you open the glove box it is to the left, almost behind the radio.

SOURCE: 2001 mercury Grand Marquis temp gauge reads cold

Replace the temperature sending unit. Don't confuse it with the coolant sensor, it's the sending unit that's bad.
The sending unit usually has a one wire connection, and the sensor has a two wire connection. I don't have my manual at the moment, so I can't tell you exactly where the unit is.

SOURCE: where are the spark plugs located on a 2000 Mercury Grand Marquis

There are eight COPs (coil-on-plugs) to remove. Using a 7mm or 9/32" socket, remove each bolt securing each COP to the intake manifold on top of the engine. Remove all eight COPs, and the spark plugs are underneath. When replacing the spark plugs, use only the proper Ford/Motorcraft plugs, even if they cost twice as much as the aftermarket ones. You will avoid further headaches this way. Hope this helps.