My radio was working when I bought the car about a month ago. After I removed the fan to fix a leaky coolant line, it quit working. The LCD on the radio shows a time, but when I turn it on, the antenna doesn't go up and I have no sound. The antenna switch on the dash does nothing either. I checked my fuses and they all look OK. Where should I start troubleshooting something like this? I don't have much experience working on these things yet. (Radios and Mercedes!)

My car is a 1984 300TD.

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"Gerwalt" 1984 - 300TD