Original owner, 133K miles, flushed system every 50K--Engine is Overheating after 10 to 15 mins. Upper hose line to radiator shakes w/ bubbling when hot and overflow cap whistles with new & proper mix of fluid. No hot air through cabin heat with full fan and highest temp.
What I have completed: changed thermostat; flushed lines w/treatment; blew out lines to heating coil and throughout upper system. Coolant flows out reservoir & radiator drain, line to thermostat, upper lines during inline radiator flush. Can't be sure of the flow through radiator or determine what is a proper flow of coolant during engine run.
Could radiator be clogged or waterpump bad?