replaced heater core and still no heat of the passenger side what else could it be or should I do
What is your question?
also replaced heater blend door actuator on passenger side as well plus flushed radiator twice at cost of over 1200 due to labour what else could be wrong
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Either some kind of blockage, the actuator door itself or another actuator. If this was done at a shop they should not charge you for the parts that didn't fix the issue.
Alex