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why wont my heat work in my 91 buick skylark? on 1991 Buick Skylark

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i have replaced the water-pump,thermostat,heater core ,radiator,heating sensors,heater control module and a new radiator cap but still no heat what could this be .its not the blower it blows strong but only cold air and the car doesnt over heat
(1) Answer
Hot water obviously isn't reaching the heater core.Sounds like it's related to a valve or you have an air lock somewhere.