I charged the system (turns out it took very little refrigerant, it was within spec already) and the driver's side still does not blow cold. Can someone suggest the next most likely issue and how to address? I suppose I could start by having the climate control head unit tested?

Thanks,
g

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64 230sl, my daily driver
94 E500, sold
98 E320, family and dog hauler
04 C240, safe machine for teen drivers, but a poc
08 audi a4, yes we have gone to the dark side