Update: turns out it was not the radiator but heater core male part is squared off and not fitting into the hose right causing a slow leak. I wont know till Monday morning if 5 year 60k warranty will cover it. If not, its 7.5 hours of labor and a new heater core. Part is $445 and labor $1100! I cant find an aftermarket heater core online for 2017 G4 and Im assuming the labor is going to cost the same where ever I go. Unbelievable. I seriously doubt Mitsu wont weasel out of covering it. Could a goodwill discount be offered?
The problem area