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1973 MB 350 SL Euro 116 engine
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With the key on, but the engine stopped, do you hear a click from the compressor clutch when you select A/C?
Can you manually turn the inner section of the hub on the front of the compressor (engine shut off of course)? It's the inner flat ring that's ~3" in diameter and on the very front of the clutch, it should turn smoothly with some resistance, no gritty or lumpy parts.
 
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