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Remember always start with the cheapest solution, in this case a/c fuse.

Happened to me. Find the drier, behind drivers side headlight. Its a black cylinder with the refrigerant lines going in and out. Take the wires (they are black, 90 degree angle) off the drier switch (larger sensor at top of drier) and jump them with paper clip to see if compressor will engage. If so, switch may be bad. Also, inside of footwell, under the steering wheel area, drivers side, the evaporator temp sensor could have gone bad. You will have to remove under steering wheel cover to access temp sensor. If faulty, will not let the compressor engage. Likely cause, pressure switch.

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Q: If the air conditioning system is full of freon however the compressor wont engage where would you need to check for malfunction '91 Mercedes 300SL?
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