Ok I’m new so I apologize ahead of time for mistakes.
The problem I’m having is with a 1994 mercury sable 3.8
Let me start off with the things I’ve fixed, water pump, thermostat, radiator, complete head job done profesionally, and fan is straight wired to run on high all the time.
Now the interesting part. The car immediately overheard when the AC is turned on and only when it’s on. It only overheats when your moving, not when your in park or in stopped traffic. What the heck is going on with it? All fluids are changed regularly and full. i unplugged the temp gauge sensor when running and it did not drop the needle does this mean it’s bad?