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Re: Trinary and 3 relay electric fan questions
The resistor is generally to keep the PCM from seeing a ground on the fan control circuit that it didn't send. If it sees that ground, it assumes there is a short in that circuit, and therefore will trigger the CEL. Since you have HPTuners, I would just forgo the resistor and just turn off the error reporting on that circuit.
Also, if you hook the trinary to that green wire, you will get both fans on low when the AC needs it, but if you hook it to the blue wire you will only get one fan on high, but if the engine temp is already high enough to have them on, and let's face it, whenever the air is on, it's hot enough, you will get them to both come on high. So I would personally hook it to the blue wire.
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