Air Conditioning problem
1991 Toyota Corolla 4 cyl Automatic
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The air is not that cool anymore. What do I do?

Take it to an AC expert, you have a leak somewhere, most likely the compressor is bad.

These cars are equipped with R12 freon, which is very expensive and hard to find.
You would probably be better off converting to R134a.

You will need to find out where the leak is, before spending any money on converting.