Your car has the older version of the aux fan. It is a "3 speed" unit that is controlled by 3 different circuits - each of which is based on different inputs.
Each circuit has its own sensors, relays and fuses.


The slow speed should be activated any time the AC is on - as long as the "external" temperature is above 10C as shown in the instrument cluster.

The most common fault for failure of the low, or low & Middle speeds is a failed resistor. There are 2 large resistors in the wiring on the front of the fan. These are used by the low and middle speed circuits to get the lower speeds.

The fan should also be able to be spun by hand quite easily. If it is hard to turn as you say then the motor is likely seized - that was somewhat common on those and has caused some fires. Another factor can be debris collected at the bottom that is preventing the fan from turning properly. It is important to clean around this area and between the 2 rads.

Some people have been able to clear a seized fan by soaking the motor in WD40 for a few days and working it by hand - but I would not trust that given that a few have gone up in flames when seized.

Do not confuse your fan with the later "variable speed" versions that are completely controlled by the engine computer.

Cheers
Jim Cash

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