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The heater box has controlled doors to direct the hot air. When one of the doors is stuck closed, hot air cannot go in that direction. The passenger side vent door must be closed.
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∙ 9y ago
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Why does my 2001 Grand Prix send AC to the driver side and Heat to the passenger when both climate controls are set to cold?
Could the heater door actuator be bad? What is the cost to replace? This Grand Prix has a dual-zone climate control and when the AC is on, the passenger side vents often change to heat when the control is still on cold.
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Not sure what you're asking, but dif this is happening all the time, you might have a dual air control system. You can adjust the temp for the passenger and the driver, and the control may be faulty.
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