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 Thermo fan, how is it controlled ? 
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Speed Limit Obeyer
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Joined: Sun Jul 19, 2009 2:07 am
Posts: 70
Post Thermo fan, how is it controlled ?
One of the issues with this new car is that most of the dash guages don't work.
The most worrying of those is the temp guage, so i don't know if the car is getting hot or not.
The car has a viscous drive fan which is good but can anyone tell me what controls the thermo fan ?
Is it controlled by the guage or is there a temp switch somewhere I can check ?

The car has oil pressure, if I can make sure the temp is going to be okay and sort the charging, then I won't stress about driving the car between now and me pulling the dash out and trying to sort the guage issues.

The clock works great though !! Awesome !


Thu Jul 23, 2009 7:16 am
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Joined: Mon Jan 07, 2008 8:43 pm
Posts: 2078
Location: Sunny San Diego
Post Re: Thermo fan, how is it controlled ?
Most likely culprit on why gauges aren't working is the PCB (Printed Circuit Board) behind the Pod. Some have had luck by cleaning the contacts, but it didn't work for me. I will be replacing my PCB in the future as my most important gauges work most of the time.

Electric Fan has a Thermo Switch mounted on the Radiator (lower). It will be on the opposite side of the small drain plug.

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1981 Porsche 928 "Euro" 4.5 Litre Auto Gunsmoke Metallic Flat - Black Interrior
1983 Porsche 928S "US" 4.7 Litre Auto Light Bronze (Copper) Metallic - Brown Interior


Thu Jul 23, 2009 10:21 am
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Joined: Sat Jan 12, 2008 10:10 pm
Posts: 664
Post Re: Thermo fan, how is it controlled ?
The clutch fan is filled with silicone oil, when it isn't hot it should spin freely, and when it is hot it should lock up (feel very stiff when you try to turn it with the motor not running). Bearings wear and silicone oil leaks out, either replace or attempt a refill.


Thu Jul 23, 2009 10:40 am
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