If you are saying that it's working now, then you have found the problem.. Very common for fuses to be corroded and/or defective. If it's not working properly then you will have to look further. There is a control relay for the AC, but I don't know it's location for your car. Maybe Steve or Donnie can give you that..

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Jeff Lawrence
1987 300e
1989 300e
1987 BMW 325