I would enjoy helping you but there are over 33 steps that need to be followed for the removal and installation of the heater core and there is not enough space to write it all down.
Its best that you get a repair manual because its a very complex and time consuming job........
Replace the flasher relay if none of them are working.
There isn't one. The 1995 Grand Marquis uses a lighting control prossessor. They are very expensive to replace. The part cost me $325.00.
The thread on cap on the engine coolant reservoir is the " radiator cap " on a 1995 Mercury Grand Marquis
On a 1995 Mercury Grand Marquis : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
In the fuel tank
15 inch
See detailed instructions here... http://www.autoclinix.com/Mercury/Brakes.html
On a 1995 Mercury Grand Marquis , 4.6 litre V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
yes
You can find the 1995 Mercury Grand Marquis cigarette lighter fuse in the fuse box. The cigarette lighter fuse will be in the second column, fourth from the bottom.
For a 1995 Mercury Grand Marquis , 4.6 liter SOHC , V8 : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
Blown fuse.