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You are getting no heat from the heater core. Do you have hot hoses on either side of the vacuum controlled heater water valve (I am assuming there is a vacuum control valve in series with the core)? If yes and the engine return water hose coming out of the heater core is cold......you have a plugged core. If the heater core side of the vacuum controlled water valve is cold but the feed side of the valve is hot and you are calling for full hot on the dash control, then perhaps there is a vacuum leak (control valve not responding) or the water valve is jammed closed or is defective?
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