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2006 Aero manual, AC blows cold air on driver side vent next to the driver side window, center vent and passenger side vent blow warm air, I thought it was low on refrigerant so I went bought a can of R-134a, turned AC on fan to max, low pressure side pressure is around 40psi so I charged a little to 45psi and stop, don't want to over charge the system, still only driver side vent is cold, so what could be the problem?
 

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I would have it vacuumed down and recharged with a professional machine. Only way to know how much is actually in there. I don't see a door or actuator causing this however it is possible.
 
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