E30 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.

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. Remove the front license plate if present and remove the 2 mounting screws holding the resistor bracket to the aux fan assembly. 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. E30 aux fan questions.

Once the temperature reaches a certain dangerously warm level that the engine driven fan doesn t seem to be compensating for. I ve confirmed the resistor is bad so the fan doesn t run. 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. The e30 m3 or otherwise a c fan is the same fan as used on the m3 that does not have a c.

If you get a successful conversion in place i d be very interested in knowing which spal model you use. 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. E30 aux fan resistor replacement and the two different e30 auxiliary fan types rts your total bmw enthusiast.

These instructions are for the bosch resistor pictured below on the right. The high pressure reading reaches 425 then the high pressure switch shuts down the compressor. I noticed in the bentley manual the fan should come on at one of two speeds once the car temperature is a certain level. I m planning on getting my a c working this summer and the aux fan is a necessary part of the a c on these cars.

The aux fan should activate. 17 40 1 373 177 bosch ceramic aux fan resistor 64 12 1 388 069 magna black aux fan resistor. Bmw can supply the correct brackets to mount this fan without mods or drilling extra holes. These instructions are for the bosch resistor pictured below on the right.

Some e30s have a ceramic one by bosch other have a black metal one with cooling fins made by magna.