well, mixing different years parts on a taurus can be a recipe for fun.
Long ago and far away, i put a 96 motor in my 97. started, drove,
seemed OK. but could not code scan and AC
The dude that dropped my motor in did NOT change the engine wire
harness and left the 96 engine harness on the motor.
It should be the same, right? all the connectors looked the same.
after untold hours of research and 96 and 97 electrical
schematics, i found out ford has a bad habit of changing a few
wires around frequently in there wiring. Maybe not enough
to make the car not run, but enough to cause issues
By the time i discovered this, my old 97 motor was gone
with the proper harness on it. I had to figure out what was
wrong, break open the harness, and rewire 4 wires.
In my case on the AC
, the ground for the pump was
wired differently between the 96 and 97 engine harness.