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929 Radiator Fan

929 Radiator Fan


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929 Radiator Fan

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Old 11-07-2009, 12:23 AM
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929 Radiator Fan
Anyone found a reference for what temperature the radiator fan should turn on?
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Old 11-07-2009, 1:01 AM
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Re: 929 Radiator Fan
220 F
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Old 11-07-2009, 3:37 AM
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Re: 929 Radiator Fan
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Originally Posted by red929 View Post
Anyone found a reference for what temperature the radiator fan should turn on?
Like all water-cooled engines the fan should come on just after boiling point - around 102C.
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Old 11-09-2009, 3:28 PM
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Re: 929 Radiator Fan
105c on mine, which if my maths is right is 220f
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Old 11-09-2009, 3:29 PM
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Re: 929 Radiator Fan
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Like all water-cooled engines the fan should come on just after boiling point
water under pressure won't boil at 100c btw
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Old 11-09-2009, 7:42 PM
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Re: 929 Radiator Fan
Quote:
Originally Posted by machinehead View Post
water under pressure won't boil at 100c btw
Yes, I know :-)
Boiling point as a constant though is 100C at sea level.
Under cooling system pressure it's slightly higher, hence the "just after boiling point" statement.
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Old 11-09-2009, 10:35 PM
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Re: 929 Radiator Fan
Thanks guys. I finally found the reference in the service manual.

Fan motor switch

Start to close (ON) 98-102 C (208-216 F)
Stop to open 93-97 C (199-207 F)

Strange because mine use to to turn at about 195-198 F.
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