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Old 11-02-2018, 03:29 PM   #1
LeedomtoFreedom
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Default Cooling fan wiring

Just curious if lh2.4 has an output for the two speed cooling fan on either ECUs. Currently wired to a 2-way switch, currently very annoying.
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Old 11-02-2018, 04:00 PM   #2
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Yep, need to wire it like a 9 series, and add the pins to the ECU connector, BUT, I had mine wired like factory and the temp settings that it uses are a bit higher than I liked and it would run warm before switching on the fan.

I used the ubiquitous SAAB T and switch in the lower rad hose YMMV
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Old 11-02-2018, 04:14 PM   #3
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Did you use the two speed relay? When I pulled it from my 940, it didn't seem to get too hot before kicking on.

I'll have a look at a wiring diagram and figure out what pins.
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Old 11-02-2018, 05:15 PM   #4
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Hayden makes a dual speed adjustable fan controller. The high speed fan comes on when the adjustable low speed fan temperature is exceeded by 10°.

https://www.summitracing.com/parts/hda-3654/overview/
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Old 11-02-2018, 05:18 PM   #5
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Quote:
Originally Posted by LeedomtoFreedom View Post
Did you use the two speed relay? When I pulled it from my 940, it didn't seem to get too hot before kicking on.

I'll have a look at a wiring diagram and figure out what pins.
I did use the two speed setup, I currently have the switch trigger the high, and the pressure switch for the AC trigger the low speed setup, it works ok I suppose.
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Old 11-02-2018, 09:26 PM   #6
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Quote:
I used the ubiquitous SAAB T and switch
Which Saab did that come from ?

Also does anyone know of a good two speed fan switch. I think BMW make one but is it really necessary to have both speeds or will low speed suffice.
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Old 11-02-2018, 09:35 PM   #7
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I just use the high speed circuit of the relay, it has always worked great. I have a Saab T if you need one, I don't remember what I pulled it out of, but I just use the pusher fan temp sensor in the radiator, lower temp version.
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Old 11-03-2018, 12:53 PM   #8
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Not all ECUs can drive the fan relays. The 937 can, the 951 can't. If you open it up, there should be a ~1/2" x ~1/2" square black chip roughly between the heatsink bar and the connector. If this spot is empty (just empty silver solder pads), then the ECU can't drive the fan relays.
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Old 11-06-2018, 09:58 PM   #9
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Ive got the electric fan/relay setup and the Saab T. Does anyone have the part number for the temp switch that goes in the T and any pics of everything wired up? I'm clueless when it comes to wiring.
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