Hey all!!! New to the forum and Love all info!!! I'm hoping like crazy someone out there can help me.. I've got an 04 CTS I just bought.. I'm trying to hunt down and fix a coolant leak.. I believe I've got it traced down to either the gasket holding the Thermostat Housing to the head or what looks like the rubber Heater core lines coming from the firewall.. I've been on top of the motor below the motor.. I even rented a cooling system presure tester and pumped that thing for 45min straght with out the needle moving.. Anyone out in forum land have any diagrams, tricks, or anything that might help me out???