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Old 09-15-2018, 11:17 PM   #1
Das Delfin
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Electric fan conversion + A/C aux fan

Hey guys, doing some work on a friend's e21. He wants to do an electric fan install. I'm trying to do it the cleanest way and use the bmw switch 6131136427282 to activate the electric fan. However, he wants to keep his A/C condensor and aux fan and there is only one sensor boss on the radiator.

What problems would arise wiring it so both fans are activated by one switch and as such both turn on at once? Do we even need both fans?

Situation A: fans kick on when temps rise sitting at a stop light
Scenario B: fans kick on when A/C is turned on

We have a 16" Spal fan acting as a puller in place of the clutch fan. Could I eliminate use of the aux fan altogether so the Spal could both cool the radiator and in theory the condensor? I say in theory because his A/C doesn't work but he wants to keep it all there so we're trying to plan ahead.

Thanks all
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Old 09-15-2018, 11:59 PM   #2
reelizmpro
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AC (and 1 stage of temp switch) kicks on the low speed circuit for the Aux fan. You can remove the high speed Pin from the connector and have it power the Spal puller fan with the same dual temp switch. If he wants to keep the condenser, then he should probably keep the aux fan as well.
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