Possible No flow to heater core?

If core is flowing properly,and all components are working correctly with engine at operating temperature both hoses should be hot.

fill rad ,pull hoses off core and set them in a bucket. One should flow out, other should suck coolant. Im betting the fittings at block end have corroded shut.

I check for coolant flow by running engine with cap off and coolant a tad low. When t-stat opens you will see coolant moving through rad.