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Buick airvent Problem


I have a Buick park avenue 1998, 3.8L V6 engine. the problem is:

The ac vent on the driver’s side blows cold air but on the passenger side blows EXTREMELY hot air. no matter how cold or hot you set the ac it blows at the same temperature on both sides. Florida heat is setting in and my passengers are melting.

Im really hopping that is not something to bad and that i can fix it myself.

Tip: this started happening after i had the alternator and the battery replaced.

Thanks for your help.

I suspect the duct airflow module is not working properly. (I forget the correct terminology)

There may be a duct door disconnected or damaged and cannot direct the air flow in the desired mode.

The replaced battery and alternator have no bearing on the problem.