Some cars have two temperature controls one for the passengers compartment and one for the drivers compartment . You may have one turned to warm or the control for one may be defective On these cars with dual controls you have 2 Blend doors one of the blend doors may be defective.
SOURCE: 1998 buick regal super charge. air conditioner
Your passenger side blend air door actuator has most likely failed. I hope this helps.
Thank You,
Roy
SOURCE: WHAT IS WRONG WITH THE AIR CONDITIONER IF THE 2
By my experience you have a low charge, it sounds nuts, but for some reason it will blow warm on pass side and cool on driver side with low charge.
If the charge is correct, than you have a actuator issue.
It will have to be looked at for proper diagnosis.
I would start with a a/c performance test.
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