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Wouldn't want to speak for all cars, but my 1997 Mazda Bravo (aka Ford Courier) seems to have the following setup:
the fan speed is controlled by adding 1 Ohm 1 A resistors wired in series.
eg Fan spd 4 has no resistor, spd 3 = 1 Ohm, spd 2 = 1+1=2 Ohm etc.
(at least 1 amp resistors are required - I used NiCr wire coiled up to allow cooling.)
The resistor pack is screwed onto the top of the blower motor behind the glove compartment.
Cheers
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