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heater core is leaking.
The thermostat is located on the front of the engine under the elbow at the end of the radiator hose
The 1996 Mercury Grand Marquis OBD 2 port is on under driver side dash next to center console
If you don't see it under the hood, then look under the car just in front of the rear wheel.
No, under dash
Under the spare tire.
the fuse box on a 1991 ford grand marquis is located right under the steering wheel
Under the dash on the drivers side.
Inside the front right and left fenders, just under the side marker light, I believe. If it doesn't work at all, check the relay first.
according to Autozone, under the driver's side, in front of the rear weelwell, mounted on the chassis in the fuel line.
under the hood on the drivers side front of the wheel well right behind the washer fluid tank
fuse box under steering wheel