I had the same problem with my car about 2 weeks ago. I did add some more Freon. But it feels like the one side is a little warm. Is it possible that the Mono Valve is letting a little wam water through, on the left hand side? I just replaced the evaporator temp sensor.. All the values are close #2,3,4,5 Now.. #5 was way high...

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Peter L. House
1998 Sport E430
Azure Blue
110,000k Miles

1987 Oldsmobile Cutlass Salon
V8 Bucket Seats
Factory Moon Roof