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

Edit
while driving it will blow really cool air for about an hour and then it starts blowing hot
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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.
check mechanical linkage under bottom panel ..far right side just up from floor
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