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Old July 12th, 2010, 13:50
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hubs97xj hubs97xj is offline
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Location: Fort Wayne, IN
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Re: Radiator Fan Override Switch (The Easy Way)

(apologies to fyrfytr for cluttering up the thread)
Okay, poking around with the meter, doing some googling. The light blue wire isn't ground, it's power. Ground is black, and unswitched. The relay in the PDC, when energized, puts 12V on the blue wire, fan runs. Taking an educated guess here, but is this how you actually wired it up, Charles? (and sure enough, the PCM doesn't monitor the fan, just the control ckt)

Switch off, stock power wire connected to 87a (NC) contact, wire from fan connected to 30, fan runs only when PDC energizes.
Switch on, battery power on 87, fan on 30, stock power wire held open, fan runs constantly.

Have I got it right?

Last edited by hubs97xj; July 12th, 2010 at 13:55.
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