I know Im gonna sound stupid here, but they say there are no stupid questions.. but what is the purpose of putting a 'bleed hole' in the ring of the stat? Looking for some education here lol
Helps bleed air out when filling with coolant. It is ALSO why I 'preach' to remove the heater hose next to the stat. This creates a massive large hole to allow air to burp out as you fill the system.