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Good evening. Is your Tacoma equipped with dual zone climate control where the driver or passenger side can be set to different temperatures?
This is most commonly caused by a low refrigerant charge. What happens is the cool refrigerant passes through the evaporator but it is not as cool as its supposed to be due to the low charge, it cools the drivers side down first but by the time the refrigerant moves to the passenger side of the evaporator it is no longer cool.