PWM radiator fan controller

[parsonsj]

Andrew reports that my controllers work perfectly.



And so after a considerable amount of debugging, testing components, and general frustration and angst... I called GM Powertrain today and talked with tech support. They tell me that the fan pwm circuit is disabled in the GMPP crate motor ECMs in an effort to simplify tech support and reduce warranty claims.

So: you guys with GMPP crate motor E67s... how did you get your PWM fans to work?

[terrydmorgan]

Mine's not a crate motor, so I may be OK. Did you ask if you could get new software with pwm enabled? Seems like a fair request since they probably don't advertise the reduced functionality.

Andrew reports that my controllers work perfectly.

And so after a considerable amount of debugging, testing components, and general frustration and angst... I called GM Powertrain today and talked with tech support. They tell me that the fan PWM circuit is disabled in the GMPP crate motor ECMs in an effort to simplify tech support and reduce warranty claims.

So: you guys with GMPP crate motor E67s... how did you get your PWM fans to work?

[parsonsj]

In a follow-up call, I asked if the crate E67 honors the AC pressure input. Answer: no. No support for A/C pressure.

I asked about reverse lockout. he didn't know, but will check with Engineering. I'll get an email response.

Maybe a new ECU is the way to go.

[parsonsj]

But, It's just a software issue, right?

I don't think so. I can set the pwm option in my HP Tuner options. It loads to the ECU, etc. It just doesn't work.