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

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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
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Hot water obviously isn't reaching the heater core.Sounds like it's related to a valve or you have an air lock somewhere.
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