Does it have three antenna connectors on the back of it? or two? Com, Nav, GS-(opt). like a lot of radios from that time, the glide slope receiver was internal to the radio, but the antenna splitter was not.
The AWOS is in the middle of the field, where as the missed AP is a lot closer to the ocean, That marine layer can be problematic, I've seen the field reporting VFR but the approach end of the runway at 100' ceilings. I'll sometimes query the tower about the ceilings to the east.
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Might be that the Side tone is set to high. You'll only hear side tone when the Radio is TX'ing so it won't affect the intercom, just when you key up the radio. The side tone is coming out the ear speakers in the helmet and feeding back into the mic. Place your hand over the mic to shield it...