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Cooling fan relay question

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Old 03-07-2008, 12:35 PM
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Question Cooling fan relay question

I can't seem to figure out why I can't get the "Search" to work, so I'm posing this question:

Can someone explain what each of the three cooling fan relays do for LS1 F-bodys? I have a 160* thermostat and want to keep the engine closer to 200* for smog testing instead of driving out of the way to my tuner to have him adjust the fan settings, so last night, I played with unplugging the relays until I found one that seemed to only turn one fan on, keeping my coolant temps' about where I wanted them. I would just like to see if someone could tell me what circuits specifically each relay controls.

Thanks for any help anyone can offer.

Chuck
Old 03-07-2008, 04:19 PM
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The 3 relays together allow the PCM to connect the 2 fans in series (each fan runs at low speed) or in parallel (each fan runs at high speed).




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