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Q: AC unit on 1991 Mercedes-Benz 300E

My AC is blowing hot air. I just have it serviced and recharge last summer. Everything was working, no leaks and was able to take charge. Now when I go to turn it on it will not blow cool, just hot. I also just replaced the motor blower.
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It may have a small leak that was undetectable at the last service. Some shops add a fluorescent dye to the refrigerant so that even the smallest of leaks will leave a sign and can be detected later on. If it needs to be recharged, make sure the shop adds the dye and has the equipment to check for leaks.
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