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05-22-2011 #1
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- Join Date
- Feb 2007
- Location
- USA, TN
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- 850
Controlling the fan with GMPP ECU
I have an LS3 eRod engine and ECU. The car also has a Vintage Air gen IV system with a trinary switch installed. I can't find and input for the GMPP ECU to tell when the AC is running. My dillema is; how to tell the ECU to switch on the fan. Should I just tap into the the fan relay that's in the GMPP fuse panel. If so, do I trigger it on the ground or positive side of the relay?
Is it possible the engine senses the extra load and turns on the fan when the AC is on?
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