I installed a newer radiator fan from a 1992 Jetta in the salvage yard. The newer fan has a more powerful motor, more blades, and instead of a resistor, it actually has dual power connections to the windings instead of one. I got a plug from the salvage yard, and I made a VERY simple harness for the fan. Power goes from the stock radiator connector to the radiator thermoswitch, where two wires come out, and go to the high/low pins of the fan connector. The ground goes from the fan to the stock wire connector. No relay – it is not required, and a relay will not make the fan faster in this case.
