I've got some FlexLite fans, I think they are 410's, and was wondering how to wire them. I'm using the LSX style wiring harness and computer. Does anyone know if the LS1 pcm controls when the fans come on and fan speed? I don't have AC so I don't have to worry about the fans being engaged when the compressor turns on. I was wanting to connect the fan wires directly to the stock fan connector, just to simplify things.

 

Anybody have anything on this? I connected the + and - from the individual fans to the two stock connectors. I have a manual fan switch and on low both fans come on at low speed, but on high, the passenger side runs on high and the drivers side doesn't run at all. Anyone know why this is.

 

Post a schematic. Is your manual fan switch turning on the relays like it should, or the fans directly?

 

It is like the LT1 fan wiring/relays. Your switch has to operate all the relays for both fans to operate at high speed. Are you grounding both relay control wires with your switch when it is on high (assuming this is the method you are using)?