1989 Mercedes 300TE / radio

recently purchased a 1989 300te had some work done on the a/c unit, anyway after all was done i realized the am station would not work on the radio anymore, took it back to my mechanic and he checked it over but couldn't come
up with an answer as to why the radio works fine except for the am stations. unable to tune in any am radio at all.....is there something i could be missing or i could check out ?
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