Can anyone give insight on how to diagnose this system without scanner assistance. New snap on doesn't have proper adapter. Old genisys has screen [...] is the computer controlled system with ccrm relay set up. I know I can run 12 volts to fan to see if it...

FIX posted 9/11/2020

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle