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Old July 12th, 2010, 15:33
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CharlesS CharlesS is offline
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Join Date: Mar 2003
Location: Quezon Province, Philippines
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Re: Radiator Fan Override Switch (The Easy Way)

Originally Posted by hubs97xj View Post
(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?
On my '98 I cut the ground wire going to the fan motor an attached the incoming to term 30 and other end to term 87a and wired in an additional ground wire to term 87. 87a is N/C and 87 is N/O. 87a is used for normal use by the AC and 87 is used for manually running the fan for extra cooling of the engine. This setup has worked fine for over 7 years.

Last edited by CharlesS; July 12th, 2010 at 15:48.
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