PWM radiator fan controller

[parsonsj]

Yes, I get the difference in frequency for the different fans. I tried 100 Hz just now for fun. No joy.

This isn't a tuning issue, I don't think. GM disabled pwm fan control on purpose on the crate motor offerings. It's not clear to me if that was done in the ECU, or in the OS.



Hedging my bets, I have a 2011 E67 (originally off a V6 Malibu) on its way to a fellow in Austin who is upgrading the VIN and OS to a 2011 ZR1. From there, I can transfer my LS9 tune to that setup, and then I'll have my fan control. It's been an expensive and frustrating lesson... I was told this would work, but it doesn't. Not with the crate motors.

Oh, and one more thing: I've had two tuners tell me that the C6 controllers are problematic, and that the smart guys upgrade their controllers to high quality solid state relays. So I put all this work and money into getting to the C6 controllers, and that might not be the best destination!