I have a 1990 A2 Jetta GLI that has a radiator fan run-on problem. The problem is that the fan is running while the engine is completely cold. It only runs when the control head for the heater/AC is in the
3 A/C positions or the Defrost Position. I assume that this means that I have a faulty high pressure switch in my AC system, as the fan is trying to cool the A/C system to prevent a high pressure head on the AC coolant pump. Where in the engine compartment is this high pressure switch located? I disconnected both of the switches on the A/C line that I thought could be the one and still the fan continued to run. Let me know if you think it might be some other problem as well.Thanks, Mike D.