Dual fans compared to single fan

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May 19, 2004 | 12:11 PM

Rickj350RS

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From: WI

Car: '90 Camaro RS

Engine: Aluminum Brodix-block SB 427

Transmission: Turbo 400

Axle/Gears: Moser 33 Spline 4:10

Dual fans compared to single fan

I was wondering when the second fan turns on with the dual fan setup. I was told that it comes on only when the a/c is on and when the engine exceeds a certain temp. If so, what is that temp? Thanks a lot. Rick

May 21, 2004 | 05:53 AM

Danno

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Joined: Aug 2001

Posts: 1,896

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From: Warrington, PA USA

Car: "02 z-28

Engine: LS-1

Transmission: 4L60E

234 degrees, aux fan is not ECM controlled. It is run from a temp switch on the pass side around cyls 6&8.

May 25, 2004 | 03:36 PM

Rickj350RS

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From: WI

Car: '90 Camaro RS

Engine: Aluminum Brodix-block SB 427

Transmission: Turbo 400

Axle/Gears: Moser 33 Spline 4:10

Is the second fan is controlled by the ECM if it is Speed Density?

May 26, 2004 | 11:03 PM

Pro

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Joined: Oct 2003

Posts: 1,083

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From: DFW

Car: 1992 Z28

Engine: 5.7 TPI

Transmission: 700R4

Axle/Gears: G80 3.23

Quote:

Originally posted by Rickj350RS
Is the second fan is controlled by the ECM if it is Speed Density?

My 91 model is (speed density as well).
But overrode the ECM and coolant switch using a variable speed controller made by flex-a-lite. Keeps temperature at 195. No more of that 235 degree