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Hi, My name is Jay
One fan is for the engine and has two speeds. The other fan only comes on with the a/c. When does it overheat and how quick after it starts does it overheat?
What engine do you have? The 4 or 6 cylinder?
Has anything been changed to try and fix the problem yet? Like the thermostat?
Here is the wire diagram so your father can see if the system fans are going into low and high speed and can check the low and high speed fan relays.
Did you put in a thermostat?
Try to replace it with a new one and replace the high speed relays in the diagram I gave you and see what happens. I would not recommend using a used thermostat from another motor that may have been bad already.
Since you put a used engine in you have to start somewhere.
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