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Q: why does my air conditioner work really good sometimes? on 1991 Buick Park Avenue

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
while driving it will blow really cool air for about an hour and then it starts blowing hot
(2) Answers
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My 99 Park Avenue was doing this a few weeks ago. It was weird, because sometime it was just hot air, and sometimes it was cold air from the passenger side vents, and hot on the driver's side (at the same time). The culprit was low coolant.