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Q:

i put a/c on then fire started under hood ft driver side by brake fluid cont on 1991 Mercedes-Benz 350SD

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it looked like a couple of wires why would the fire start there it was like under the brake fluild jug it was hard to see
(1) Answer
It sound like your A/C compressor clutch has locked up. Take it to your local shop of your choice, and tell them that your compressor may be bad. You will need a new one.