High Quality AC Compressor Drive Belt Tensioner 31251654 for C30 C70 S40 V50 Air Conditioning Replacement Parts

Genuine Accessory Drive Belt Tensioner – OEM Grade 31251654

Fixes Squealing Belts and Slipping Accessories, Without the Dealer Price Tag

Your customer's C30, C70, S40, or V50 has a squealing or chirping noise from the engine bay, especially at startup or when the A/C is on. The accessory drive belt tensioner has failed. They need a direct replacement that restores proper belt tension — not a cheap tensioner that seizes or loses tension in six months.

Direct OE Replacement
Manufactured to replace part number 31251654 (also cross-references 1540605 and 8M5N6A228BA), this accessory drive belt tensioner applies consistent spring-loaded pressure to the outer belt that drives the A/C compressor from the crankshaft pulley. Same 65mm pulley diameter, 21mm width, and automatic tensioning mechanism as the original. No adapters, no modifications required.

Restores Critical Belt Tension and Accessory Function
A worn tensioner allows the belt to slip, causing the A/C compressor to lose performance, the battery to charge poorly, and the belt to squeal or glaze. If the tensioner seizes completely, it can snap the belt and leave the vehicle without A/C, power steering, or charging. This replacement restores proper tension and smooth operation.

Built to Outlast the Original
Available in premium aftermarket alternatives from INA (534027310), SKF (VKM 36252), Febi Bilstein (30083), and Gates at competitive wholesale pricing. Each unit is tested for correct spring tension and bearing durability.

Broad Fitment
Fits C30, C70, S40 (2004–2012), and V50 (2004–2012) with 5-cylinder engines from engine serial number 4293285 onward. This tensioner is for the outer A/C compressor belt, not the inner alternator belt. Confirm engine serial number and model year via VIN before ordering.

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