Q: Q: Heater blowing cold

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My heater is not blowing hot air, A/C works fine. (Water pump was already replaced previously due to a separate issue). Car is not overheating I've pulled the heater hoses off and flushed the heater core/replaced hoses. I'm thinking it's the air blend actuator could this be the possible issue or something else?

My car has 140000 miles.

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