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Old 10-04-2006, 11:58 AM   #1
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Default fan override

Awhile back i inquired about a fan override for my regal and came to the conclusion that i can only get high on one fan because running both on high trips the computer. I have a 3 relay setup and have been trying to figure out if there is anyway to wire this so both run without a computer issue. If anyone can look at this diagram and see if you think there is a way it can be done please let me know.
http://home.att.net/~madmax350/downl...0_diagrams.zip
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Old 10-04-2006, 12:29 PM   #2
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My SES light trips when my lo-speed fans are on, so I use hi-speed only. Low doesn't do much good anyway.

On the third page, ground wire 536 (grn/blk) through a switch. You can do this in the engine bay near the relay, or at B2 on the PCM. Both fans should work high speed with the switch, and operate in default mode when not.

IMPORTANT:
You are not CUTTING this wire. You are tapping an alternate ground source through a switch FROM it.
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Old 10-04-2006, 01:36 PM   #3
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I already have it wired like that and i only get one fan that way..to get both fans i had also grounded wire 535(dk grn) and it worked but tripped quad driver fault. Relay b by itself is low and c and d are high for one fan, all three together run both on high but trip quad driver. I'm trying to figure out if there is a way to get them both to run on high without the quad driver fault.
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Old 10-04-2006, 01:41 PM   #4
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Obviously your PCM and wiring are different than ours. You may have to provide a seperate hot feed and diode-protect it.
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Old 10-04-2006, 03:40 PM   #5
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Not to sound stupid, but how would i go about doing that?
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Old 10-04-2006, 03:55 PM   #6
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Energize a relay with a switch. (power the relay from ACC power so when the car is off, the fans turn off).

Have that relay switch a 20amp fuse-protected feed directly from the main buss or battery to each fan. That last leg going from the relay to the fan needs to be diode-protected to keep from 'double feeding'. Your existing circuit (wire 532 and wire 533) should also be diode protected to keep the existing circuit isolated.

That way while you are in override, and the PCM commands the fans to come on, you don't have two 12-volt feeds hitting the fan, or 12V from one feed or the other going back through the system.
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Old 10-04-2006, 04:22 PM   #7
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I think i understand now..i'll see what i can do..thanks for the help
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