Where is the radiator fan switch located on a 1992 vw cabriolet i need to replace and cant find it

IT IS LOCATED ON DRIVER SIDE OF ENGINE BEHIND THE THERMOSTATE HOUSEING IT HAS TWO WIRES YELLOW AND BROWN HOPE THIS HELPS .
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there is a fan control relay under the dashboard with the other relays check that then check the temperature contreol module theat is located in the engine compartment
--------------- there is a 2 speed sensor/sender on the lower part of the radiator, facing the driver. It's on the tube at the end of the radiator. The fan motor has three leads, an orange, which should be hot, and is monitored by a 40 amp fuse located either on top of the battery, or with the fuse modules/relays under the dash. (according to the book, I still can't find mine, it may be NEXT to the battery. The negative must be thru the chassis, so it would be a good idea if, at temperature, with two hots going to the motor, look for a shorted ground. If one of the hots isn't, then the sensor or 40 amp is bad. After those are ruled out, it's the motor.

The electric fan switch, mounted in the radiator, supplies power to the fan (via relay) when the coolant reaches a certain temperature.