My 83 factory electric fan (V6) runs constantly with ignition on. It supposedly to come on either when coolant temp switch grounds the relay or AC is ON and AC pressure switch closes. The temp sensor is just a switch which closes when coolant reaches set temperature. The temp switch and the AC pressure switch are completely disconnected, and the fan is running with ignition on. I replaced the relay module and still problem.
If I disconnect Pin 6 which provide power to solid state fan control, the fan still run continuously. If I disconnect pin 4 (ground), then the fan works only when coolant temp switch is grounded but then fan will not work with AC. Pin 6 provide power to solid state fan control.
Once in a while my coolant temp would max out even though the engine was just warm and the oil pressure would read zero. I found an YouTube Video where the guy has later foxbody four cylinder and one of the ground was not connected and the fan would run all of the time and also the coolant temp would max out even though the engine was cold.
I am wondering if there is a bad groud somewhere.
Any idea ?
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