Can I not run dual SPAL fans independently with an E67 PCM?
GM PN# 19354333
--This is the PCM for an LS376/525.
SPAL fans PN# - 30102022
I have re-rerouted the blue trigger wire of the (blue + green) ganged pair from under the GM harness's (PN 19166573) fan relay to a separate fan relay which is the chassis' native fan relay.
So I use the GM harness to power on the primary fan, and the native chassis harness (non-GM) to power the secondary fan.
Calibration file is untouched except for MAF and Speedo calibration.
At 203F both fans turn on, and stay on until the car turns off.
Now the fact that both fans turn on indicates to me that this particular harness has two trigger wires for the GM fan relay that are being controlled by a single driver in the PCM. Is this correct?
What I don't understand is why both fans are not shutting off or is there no threshold in this PCM's stock calibration file to do so?