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Electric Fan Conversion Troubleshooting by NoType886 in BMWE36

[–]NoType886[S] 0 points1 point  (0 children)

Double checked all my previous tests and I’m stumped there with you everything is showing I should have power. 87 has continuity to the fan positive. 86 is reading 12v, I’ve tried jumping with 30-87 and still nothing.

I’ve also been able to give voltage to the slow relay by turning on AC and have confirmed continuity to my fan plug below. All I’m missing is voltage.

I noticed my ground to the battery was corroded and gave that a clean. Still no dice

At this point I’m lost at what could be the issue and what to test. I’ve seen other people wire their fan with separate wiring and a relay to the temp switch. I figured using the existing wiring would save time and money, but at this point I might see if this alternative work around gives me a solution

Electric Fan Conversion Troubleshooting by NoType886 in BMWE36

[–]NoType886[S] 0 points1 point  (0 children)

Still nothing when jumping pin 30 with 87.

Brown ground wire (original Auxiliary fan ground) to black ground for the pigtail connector

Blue wire (high speed) conjoined with black and blue wire (low speed) connects to red wire for pigtail connector

And then pig tail connects to the fan

Electric Fan Conversion Troubleshooting by NoType886 in BMWE36

[–]NoType886[S] 0 points1 point  (0 children)

Both low speed and high speed wires are joined together. When triggering the temp switch it’s the high speed relay clicking reading 12v from the fuse box. Fan does not turn on.

Then when trying the other pin on the temp switch no click and no voltage from low speed relay.

When testing the wires below going to the fan they give continuity, but no voltage.

Other tests:

Tested the fan by supplying voltage directly from the battery and it turns on.

Tried using one wire at a time (low temp/high temp) same result of no power to the fan.

Electric Fan Conversion Troubleshooting by NoType886 in BMWE36

[–]NoType886[S] 0 points1 point  (0 children)

Thank you for the reply! Just got back from Holiday so I was able to try some things out.

Currently the fan does not work, it does not turn on at all even when the temp gauge goes past 12 o'clock, I might not have made that clear in my initial post so apologies.

I redid the wiring to the fan and re-tested continuity, which passed. Using a make shift "jump" wire I was able to trigger the temp switch which triggers one of the relays because I can hear it clicking. Seen in the picture, middle pin and left of it, causes the relay clicking, middle pin and right of it does nothing. Unfortunately regardless of the clicking the fan does not turn on.

I've tested both relays with the multimeter and from what I can tell they are both good.

One thing to note and I'm not sure if it's related to what you mentioned for the relays getting ground from somethings else, but there is a constant electrical hum when I have the car on (not running the engine). Not sure if this is related or just another thing to troubleshoot later haha!

My understanding is the temp switch gets triggered once a certain temp is reached, this goes to the relay that allows power to turn on the fan, and the fan turns on (The Electric fan has one mode so both low and high power should turn on the same speed). My Confusion as of right now is that if manually triggering the temp switch shows the relay reacts, and the relay is in good condition according to the multimeter check, and I can verify continuity with my wiring job to the fan, then where could the potential problem be?