Quote:
Originally Posted by randy
could you tell me how you were able to control the dual fan setup with the gpmm harness? what else is needed to make this happen? It seems like the blue wire coming from the gpmm fuse box is labled fan but I'm not sure where to go from there
|
I've never used the GMPP harness stock. I think the blue wire just turns the fan on or off.
We reworked the system to do a Pulse Width Modified (PWM) fan. The ECM has a look up table on how hard the fan should run given engine coolant temp., A/C head pressure and Inlet air temp. Any of those 3 inputs determine the fan speed.
The old CTS-V used a twin fan set up and two relays. You could use the GMPP ECM for one fan and a discreet switch for the 2nd fan. Maybe one fan at 200 F and the 2nd fan at 210 F.
Mark