E30 Aux Fan Resistor

If you your aux electric fan works on high speed but not on low speed your resistor is likely burnt out.

E30 aux fan resistor.

Fan stopped on my 87 325ic causing my air conditioning to not work correctly. There are two different resistors listed for e30 s the bosch ceramic and the magna plastic encased. The aux fan should activate. I noticed in the bentley manual the fan should come on at one of two speeds once the car temperature is a certain level.

The fan should run on low speed when the a c is running and on high speed if the engine is getting close to overheating. When the ac is on. The auxiliary fan resistor is in need of replacement when the auxiliary fan does not operate at low speed. The e30 m3 or otherwise a c fan is the same fan as used on the m3 that does not have a c.

Once the temperature reaches a certain dangerously warm level that the engine driven fan doesn t seem to be compensating for. The only thing i know for sure about the aux fan is that it seems to draw a lot of amps for the amount of air it moves. E30 aux fan resistor replacement and the two different e30 auxiliary fan types rts your total bmw enthusiast. I ve confirmed the resistor is bad so the fan doesn t run.

17 40 1 373 177 bosch ceramic aux fan resistor 64 12 1 388 069 magna black aux fan resistor. In reading all the posts on the two speed fan i ve learned that the only time the fan runs on the high speed is when the radiator high temperature switch. Non bmw fans have also been fitted. The high pressure reading reaches 425 then the high pressure switch shuts down the compressor.

Some e30s have a ceramic one by bosch other have a black metal one with cooling fins made by magna. Bmw can supply the correct brackets to mount this fan without mods or drilling extra holes. E30 aux fan questions. If you get a successful conversion in place i d be very interested in knowing which spal model you use.

These instructions are for the bosch resistor pictured below on the right.