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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sun, Jun-10-2018, 03:53:56 PM   #1
JitteryJoe
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Default Lower temp fan switch

Anyone running a lower temp fan switch? From what I read the switch 61318376440 is the lower temp version of the stock switch (61318363677). Does anyone know what the differences are? Also, is it advisable to use the lower temp switch when moving to a single Spal fan only setup?
Thanks! Joe
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Old Sun, Jun-10-2018, 08:47:44 PM   #2
Earthwormjlm
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Default Re: Lower temp fan switch

If you have removed the clutch driven fan, you must use the lower temperature fan switch. With the stock part, the fan will not turn on, until your car is already starting to overheat.

I used: 61318376440

It's technically not the lower temperature version of the stock 6 cylinder switch. It's the version used for M44 powered cars, and doesn't technically fit the 6 cylinder electrical connector. It's easy to make it fit the electrical connector on your car though, just clip a little plastic tab, then it fits. It effectively works out to being the lower temperature version for our 6-cylinder cars, since it's easy to make it fit.
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Old Sun, Jun-10-2018, 09:13:14 PM   #3
JitteryJoe
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Default Re: Lower temp fan switch

Thank you! Yes, the mechanical & stock aux fan are deleted. Only the Spal fan. I'll order the lower temp switch.
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Old Sun, Jun-10-2018, 11:48:52 PM   #4
Earthwormjlm
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Default Re: Lower temp fan switch

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Originally Posted by JitteryJoe View Post
Thank you! Yes, the mechanical & stock aux fan are deleted. Only the Spal fan. I'll order the lower temp switch.
I'm curious, why did you remove the aux fan? That fan has a pretty large amount of output. What Spal fan did you replace it with?
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Old Mon, Jun-11-2018, 12:04:07 AM   #5
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Default Re: Lower temp fan switch

He bought probably the best radiator on the market for these cars - the zionsville. He can get away with less fan. Even on a stock radiator car, the aux fan is really most helpful for the AC in city driving. Most of these cars for most driving purposes are fine with just either the aux fan or the fan clutch fan. When using just one fan, a lot of people choose an electric to reduce drag on the motor. I run 2 electric fans but I have AC and 700 rwhp.

Last edited by pbonsalb; Mon, Jun-11-2018 at 12:35:46 AM.
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Old Mon, Jun-11-2018, 12:17:47 AM   #6
JitteryJoe
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Default Re: Lower temp fan switch

Yes, it is the Zionsville radiator with attached oil cooler. They recommend the auxiliary fan delete. It sits in the space once occupied by the mechanical fan.


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Old Sat, Jun-23-2018, 06:24:20 PM   #7
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Default Re: Lower temp fan switch

How beneficial or needed would it be to swap the thermostat while doing this mod. I currently have a 180 degree and stock radiator, should I go down to the 176 degree thermostat?
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Old Sat, Jun-23-2018, 06:56:17 PM   #8
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Default Re: Lower temp fan switch

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Originally Posted by motorsports_3 View Post
How beneficial or needed would it be to swap the thermostat while doing this mod. I currently have a 180 degree and stock radiator, should I go down to the 176 degree thermostat?
I would stick with the 80C thermostat not the 71C. I have been running the 80C in NH driving year round for years. 80C is 176F. I think the next step up is 88C which is 190F. That would work fine also. My car runs 176F only in winter on the highway—it runs hotter all other conditions so its not really the thermostat that controls operating temperature most of the time. It’s more the fan switch (or viscous coupling for those with engine driven fans).
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Old Sat, Jun-23-2018, 07:05:10 PM   #9
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Default Re: Lower temp fan switch

Seconded, do not run a lower temp thermostat. Track use only. The car will run more efficiently and get better MPG with the stock thermostat.
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Discussing Lower temp fan switch in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)