When you flushed the heater core, if the water flowed freely, that isn't the problem. I would focus on blend door. Make sure it is operating fully in both directions. If a mouse or something got in there, it could be blocking it from fully opening. If both heater core hoses are hot, that is where the problem has to be coming from. Plus, if you don't have to, trust me when I say, don't replace the heater core. It isn't a fun job.
Saturday, January 22nd, 2011 AT 10:29 PM