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Old 02-11-2010, 10:21 AM   #1
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Default thermoswitch in radiator - what temp?

Since my stock ECU no longer activates the fan on my '99, I'm going to install a thermoswitch.

I'm getting an aluminium radiator which has a bung for a thermoswitch, but I'm not sure at what to activate.
I guess at a lower temp than oem because the rad will be cooler than the stock location, but how much.
Anyone ever measure?
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Old 02-11-2010, 11:23 AM   #2
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I think a better option would be to put it in the heater line going from the block to the heater. You could cut the hose and put a pipe in between with a bung for the thermistor. That way, you wouldn't have to guess the temperature.
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Old 02-11-2010, 12:55 PM   #3
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stock 99 switches at 210-215*F IIRC. something like that. I always trigger at 200*F
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Old 02-11-2010, 03:26 PM   #4
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BMW sense radiator outlet temp to decide to turn the fan on, which is logical.

I would set it to 5*C above your t-stat opening temp.
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Old 02-11-2010, 07:56 PM   #5
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Quote:
Originally Posted by JasonC SBB View Post
BMW sense radiator outlet temp to decide to turn the fan on, which is logical.

I would set it to 5*C above your t-stat opening temp.
I'd make it lots and lots lower than that.
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Old 02-16-2010, 05:51 PM   #6
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Ordered a 85-75C switch and will go from there. Will do some logging in TS to see if it's right.
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