I believe you are looking for blend door actuator???
change wiper motor grand marques
( 5 quarts with filter change ) according to the 1999 Mercury Grand Marquis owners manual
It will, though technically it is illegal to istall on older motor into a newer car for emissions reasons.
how do you get to and replace the wiper moter on a 97 marquis
It is a Mercury and Mercury is a division of the Ford Motor Company so...technically it is a Ford.
Look behind the glove box. under dash.
The fuse that is marked heater.
The relay is located in the engine compartment to the right of the heater hoses if you are looking at them. It dose not look like a regular rely. It has a connector that plugs into it.
Take it to a repair shop.
It will fit, but you will have to worry about the computer.
it is on the firewall and difficult but not impossible to get to and replace.
look under the heater hose on the plastic surround approx 2 inches down haynes manual has a great picture of it I just want to know where you can buy one