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Installed Hypertech switch - now no fan?

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Old Apr 22, 2004 | 10:58 PM
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Trevor K's Avatar
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From: Edmonton, Alberta, Canada
Installed Hypertech switch - now no fan?

OK, I installed some valve cover gasket and a Hypertech fan switch. (Single fan setup)

I can't get the fan to come on. When I apply 12V to the connector from the wiring harness, I can get the fan to turn on.

Where do you think my problem lies? And can I get at this from under the car, or is the starter in the way?
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Old Apr 22, 2004 | 11:14 PM
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Trevor K's Avatar
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If anyone has an explanation of how the cooling fan switch works (IE: does it just ground with that one wire?) so I could also troubleshoot it that'd be great.
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Old Apr 26, 2004 | 08:19 AM
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From: Dallas, TX area
Car: 91 Formula WS6 (Black, T-Tops)
Engine: 383 MiniRam (529 HP, 519 TQ - DD2K)
Transmission: Built '97 T56, Pro 5.0, CF-DF
Axle/Gears: 4.11 posi Ford 9"
At least on the dual fan setup on my 91 Formula, yes, the fan switch merely applies the ground to the relay so the second fan will kick on. The primary fan on mine is controlled by the ECM from inputs by the temp sensor on the front of the intake.

Hope this helps.....


- Vern
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Old Apr 26, 2004 | 08:45 AM
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I put the hypertech switch in water, boiled it to 200deg. and it did not ground....

So I think the switch is bad. Scary - I thought by buying a brand name this wouldn't happen...
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