1999 Mercedes-Benz E430 Q&A

1999 Mercedes-Benz E430 Question: Passenger side AC sometimes works fine but the driver side blows warm air

Recently I have changed my ignition electronic switch and after that the AC started working funny all the time is warm on the drivers side and on the passenger side sometimes works fine and sometimes blows warm air too what that could be? Thanks for your efforts to assist us you are highly appreciated. -
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