Why is the drivers side dual air conditioning not as cold as the passnger side on 2003 Chevrolet Impala

Why is the drivers side dual air conditioning not as cold as the passnger side

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1 answer 2 comments
System probably low on refrigerant , common symptom on dual zone system.
thanks I'll try that first rather than replacing the unit, or at least trying to replace it.
Use guages , if you're doing it yourself. Overcharging will also cause poor performance.