When I say "new" I mean within the last year and a half - not brand new. And I know the belt is not too tight - in fact, it's slightly loose because if I accelerate very hard the belt will slip and kill the A/C.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280