If the cooling system is not clogged and the water pump is ok then there may be air trapped in system, bleed air from system if need be. if air is trapped in system you will not get any heat. start car let it run take cap off of coolant tank then find bleeder for the coolant system, open bleed screw and air may be trapped in system.make sure coolant is at a proper level. do not forget coolant tank cap when done.
Replace heater core
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sounds like it could be the vacuum switch that diverts heated air through vents. Make sure vacuum lines are serviceable and connected.
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