Dual Electric Fans Not Working - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-07-2007, 10:58 AM   #31
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Wait a minute......if you're going to do an override, let me steer you in the direction of the PCM wiring harness instead of sending you through the firewall to the relay.

That'* how I did my SSEi the last time. Much better, easier wiring, same effect. If you want to do this, send me a PM to remind me, and when I get home, I'll give you the exact wire to tap into on the PCM wiring harness, including taking a very detailed pic of it on my 95. I have no hushpanel installed right now (awaiting a new airmix actuator), so it'* perfect timing.
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Old 05-07-2007, 10:18 PM   #32
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Please note that this is for 94/95 Bonnevilles ONLY:

Remove the passenger side hush panel. Pull the CENTER WHITE connector. Blue on the left, red on the right, white in the center:

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In this pic, the rear of the car is TOP, the front of the car is BOTTOM, the driver'* side is LEFT, and the passenger side is RIGHT. You're looking UP, facing forward.



After you pull the connector, you're looking for a dark blue wire in slot D10. One side of the connector ONLY will have a blue wire in hole #10. In these pics, if you look at the top row (not marked, but not the C side), you can count from left to right 1-whatever. My thumb is next to slot 1.
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Provide an ALTERNATE ground through a switch for this wire. Don't cut it and leave it dangling on either end. Tap INTO it, providing another path to ground through a switch. When you turn the switch on, the fans will come on high.
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Old 05-07-2007, 11:38 PM   #33
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Will, thanks so much for the great write up.

Now just so there'* no misunderstanding since if I wire this up wrong, I'm not going to NEBF due to the fact that the Bonne probably won't start.


I tap into the dark blue wire in slot D10 (the wire that is actually touching the grey plastic clip on the white connector to the PCM. (see picture below) I'm taping into it with the Blue splice connector on my white wire (I've supplied). I must NOT cut D10. since it must remain one solid piece. My white wire continues to a switch and the other side of the switch (black wire) goes to ground.

What the switch is actually doing when turned on is supplying ground to D10 (dark blue) wire on the PCM.

Once installed and the switch is turned on, both cooling fans will turn on.

I will place electrical tape at the end of the switch so as to not have exposed connectors.

Is all this information correct?

D10 is the raised dark blue wire, it has an empty slot to the left and green wire to the right




White wire taps into D10 (dark blue wire) on PCM


Black wire to ground on car.
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Old 05-07-2007, 11:40 PM   #34
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You got it, bud. Dead on.

But you're actually grounding the high-speed fan RELAY just before the PCM does. Giterdun!
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Old 05-07-2007, 11:47 PM   #35
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The extra switch that I already had in the tool room has an extra prong, would that have been used as a ground wire? In other words, it'* to ground out the switch?

Do I need to ground out the switch as added protection?


The 3 prongs would have been:

Left----- Power in
Middle---ground
Right-----Power out
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Old 05-07-2007, 11:51 PM   #36
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Put the ground on the center lug. Then put the tapped PCM wire on either of the other two, depending on which way you want the switch when it turns the fans on.

Just plug it in and test it. You'll get it.
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Old 05-08-2007, 07:53 AM   #37
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Alrighty...

Are ya done yet? Looks like you are ready to come into the US with fans a blazin!
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Old 05-08-2007, 02:49 PM   #38
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Yes I am done Boosty and it works.

Willwren, thanks so much for the detailed explanation, it was perfect. I still need to get the fans working on there own but at least I can make it to Boosty'* crib without the Bonne overheating...........I hope. Will, do you have one of these hooked up in your car?
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Old 05-08-2007, 03:36 PM   #39
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Both of my cars are overridden, and my SSEi stays on high all summer long. Day and night. They turn off just before launch at the track to save loading the alternator.

The 93 is wired into the PCM harness similar to what I just had you do. The SLE is wired through the firewall to the relay. I hooked a couple of these up for Matt and John at WCBF 05 as well.

Glad you goterdun.
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