Q: Heat not coming out hot

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So when I let my car warm up and turn the heat on it comes out hot but quickly turn cold and it only comes out hot on the driver side

My car has 78000 miles.
My car has an automatic transmission.

This can be caused by the heater core having a partial blockage or by the temperature blend door on passenger side going to cold. You will need to have actuator checked first and then if it i moving door to hot and cold then the problem is in the heater core.

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