On some 5 cylinder engines the belt that drives the a/c pump is a stretch belt rather than having a tensioner and they often do this if you remove them and re-use them (I.e. they permanently stretch and become too slack). I’m guessing the didn’t fit a new one when they did the other belts?
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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