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no water flow in cooling system on 1998 Mercury Grand Marquis

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
replaced water pump, hoses, thermostat, radiator,and reservoir bottle...had overheating (1-2 times a week) issues for the last year after heater core replacement...checked for air in system..hose blew so I did all the repairs listed except heater core..now hose to thermostat gets hard and there appears to be no flow in the system again...could the heater core have failed or gotten clogged
(2) Answers
Have it tested for a combustion leak!
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A stopped heater core will not cause the car to overheat, with no flow in cooling system it would overheat every time you drive it.
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