Replace Heater core?

[m1949]

I would not change the heater core, if you are not having any issues with it. I WOULD, however, change out ALL hoses that carry antifreeze, including the two plastic Tee's for the heating lines, regardless of how they look, no exceptions.

Regarding actuators, @swathdiver may be able to assist you in identifying and diagnosing actuator issues.

Thanks for this advice. I WILL replace all the hoses and Ts