Hello,

The e40 ecm is restricting me from upgrading to a 160F thermostat because I can't adjust the fan settings to trigger on/off below 89c per the ect vs fan power scale. It is my understanding the EFI Live's custom os extends the table providing a wider range of control. I'm trying to figure out which COS I need, if one is available. Thanks in advance.

E40 ECM
GM OS 12613269

-groovin