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Belt noise w/ the A/C on
The 335 D engine has two belts: main, serpentine belt (drives alternator, power steering and several idlers + tensioner) (water pump is electric) and the short one, that drives A/C compressor directly from the crankshaft pooley. Replacing the main, serpentine belt tensioner doesn't make any sense-it's unrelated to the A/C compressor. apparently, an "Elasto Belt" is being used to drive the A/C compressor (like a big rubber band, that you stretch to install (using a special tool), and doesn't require tensioner)
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