Yeah, for whatever reason the drivers side tends to get warm while the passengers is still cold when the refrigerant is low. You can get a DIY kit as a temporary fix, but you risk damaging something. I put a couple cans in mine when it happened, AC is much better but my HVAC unit is throwing codes now. Need to bite the bullet and have a shop find the leak.
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'99 GTP, L36 bottom, XP cam, Headers, 3.29 gears, FWI, Powrtuner