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09-07-2011 #1
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dual fans with LS, PCM controlled??
Trying to get wiring ordered but not sure if or what I need to accomodate my dual fan setup. Do I need to purchase a dual fan relay kit or are the fans controlled by the PCM/EFI?
Sorry.... I worthless at wiring.
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09-07-2011 #2
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PCM will have triggers for fans, you still need relays because fans draw high current.
09-07-2011 #3
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You should confirm if your ECM has twin fan control outputs, for example a low and high temperature control. If so, you can program the ECM so that most of the time only one fan is used. As mentioned above, relays will be needed, and the ECM usually controls the negative side of the circuit.
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09-07-2011 #4
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Fwiw 4th gen ls1 ecms have low and high trigger outputs that go to 3 relays so both fans are on with 6 volts in low and both on with full 12 volts for high speed. I'd think meet ones are the same way but you should verify
Scott from NJ.
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