05 Grand Caravan Weird A/C issue

[ecruz]

My Grand Caravan has separate climate controls for the front two seats and the back seats. The passenger side and the rear get really cold. The driver side, is a good 10-15 degrees warmer. If it's over 80 outside, the driver side is blowing HOT air, even with the temp turned down as low as it can go. Also, intermittent hissing from under the dash. I'm assuming they are related. Any ideas how to fix this issue? Thanks, E-

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