R50/53 R53 coding stage 1 cooling fan
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The way the low speed fan works is simply a resistor in the system, it's not an actual 2 stage fan, I don't remember the temp ranges, but basically at lower (hot) temps and when the A/C is on, the power is sent through the resistor, causing a restriction in current and therefore a slower fan speed, above that temp point, the fan gets full current therefore full speed.
If you reinstall the resistor, just make sure that the wiring is still all there, if the previous owner got rid of it also, the resistor wiring is, and needs to be, a heavier gauge (I think 10ga) than the full speed wiring due to the extra heat generated by the resistor.
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