If the fan runs erratically continuously with the key removed from the ignition or not at all and the fuse is good the speed controller has failed and the entire fan must be replaced.
Bmw e36 318i radiator fan not working.
Engine cooling fan doesnt work.
If the fan does not run check for 12 volts at terminal 30 in the relay socket.
Click the link above.
The fan should come on at high speed.
Cooling fan problem solved bmw e36 318i.
Test the switches resistor and the fan as follows.
Replacement of the e36 auxiliary fan requires the following.
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Most bmw models 99 and later and all minis do not have the radiator mounted temperature switches.
Replace the high speed relay.
If so retry the test jumpering from terminal 30 to 87a.
Video chapters and parts used are below.
1984 318i sold.
If it does the fan motor is ok.
This video details removal of the fan and full installation of the ele.
Electric pusher fan and frame bmw part number 64508364093.
The bmw specialists here at ultimate bimmer service are proud to serve bmw drivers in the communities near carrolton and dallas tx of all the services we offer we commonly help clients attend to engine repairs and cooling system repairs engine overheating is highly inconvenient and dangerous so it s important to act preventively in ongoing automotive care.
On the earlier bmw models the fan s low speed resistor may be faulty or the radiator temp switches that control the fan may be faulty.
Time for my e36 to have a viscous fan delete.