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A 1996 Toyota contains no Freon. It contains R134a refrigerant. If it is low it has a leak which must be repaired. See professional help.
yes...can leak oil from ac bolt...threads into sside of block..must have crack in side of block..
fix the vacuum leak
Oil can either be burned, or it can leak
Probably valve gasket leak. Can be done yourself but requires some moderately complicated disassembly.
it sounds like you are either out of freon..which is a pretty easy fix or.....you may have a leak somewhere.
Low coolant level, internal or external coolant leak or faulty thermostat.
There are some oil additives you can get, that might stop the leak. But if the leak has developed, the only way to fix it is to replace the seal.
drain stopped up locate the drain tube on the passenger side at the firewall and use compressed air or a wire to clean it out, water should run out of it.
Not yet. Most parts stores do sell a R134a "stop leak"
Freon is very expensive if you can even find it. I recommend you have the system converted over to R134a refrigerant. The leak must be repaired before you can recharge the system. So you need to seek professional help to repair the leak and convert the system to R134a.
See a specialist. System needs to be purged, leak checked & Recharged.....