PWM cooling fan(s) control using ECM - Lateral-g Forums

**parsonsj** · #1 10-28-2015, 10:09 AM

Quote:

It isn't at the hardware level because that same part number (before it becomes a GMPP ECU) is used in some model year production vehicle applications.

Do those vehicles use PWM fans? My GMPP E67 pn sources back to an 07 Hummer. Anybody know if 07 Hummers have PWM fan control?

erick_e · #2 10-28-2015, 05:06 PM

Quote:

Originally Posted by parsonsj

Do those vehicles use PWM fans? My GMPP E67 pn sources back to an 07 Hummer. Anybody know if 07 Hummers have PWM fan control?

2007 H2 and H3 have a fan clutch, so no electric fan.

4wheels · #3 10-28-2015, 07:37 PM

The H3 might be an E67 ECM but the 2007 H2 is an E38 and had a conventional mechanical fan (with a thermostatic clutch).

The H3 might have a PWM controlled clutch fan like the Trailblazer etc but it doesn't have a PWM speed controlled electric fan.

Quote:

Originally Posted by erick_e

2007 H2 and H3 have a fan clutch, so no electric fan.