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Registered
Join Date: Mar 2008
Location: Chatsworth, Ontario, Canada
Posts: 561
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radiator fans-separate switch?
Anyone run a separate switch to ensure high fan speed when driving "spiritedly", or auto X-ing?
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Rick Harrison 1988 944S 17 inch Cup 2's, euro bumper conversion Magnaflow 2 1/2" exhaust with K & N 4 inch custom intake MaxHP chipped |
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08-27-2009, 08:48 AM
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Registered
Join Date: Oct 2008
Location: neither here nor there
Posts: 699
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I don't. Have not head of such a thing either but someone has probably tried it.
Maybe I'm misinterpreting your question, but the fans I have run on "normal" speed when the ignition is on (and the thermo switch tells them to), both run when the AC is on, and they only run at "slow" speed for a short time when the ignition is off (less than a minute). This was designed by porsche because the battery can eventually die if they run a lot at normal speed after shutdown. There is no fast speed afaik. If you're worried, you can wire them together so both run regradless of whether the AC is on or off, but that dosn't require a switch. I'd say just let the relay and the thermo switch do their job and I think you'll be fine... |
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08-27-2009, 09:49 AM
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Usually the people that do that are running early cars that have a more convoluted/strange cooling system and they can't make it work correctly (for several reasons I can think of
 ). They get upset the second fan won't come on and hardwire a switch to the battery to fix the problem. I heard about this at 944 online. On later cars, both fans come on at once in slow speed mode, eliminating the problem.
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09-09-2009, 12:06 PM
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Highway Star
