Parts for your 2015 Subaru Legacy-Drive belt

2015 Subaru Legacy drive-belt — what it does and when to replace it

Yes, the 2015 Subaru Legacy uses a drive-belt (a single serpentine belt). This is confirmed by Subaru’s 2015MY Legacy/Outback Owner’s Manual (“Checking the drive belt” in the Maintenance and service section) and the Subaru Factory Service Manual available via Subaru Technical Information System (STIS), which shows the belt routing for the FB25 2.5i and EZ36 3.6R engines. Major belt suppliers’ catalogues (e.g., Gates and Dayco) also list an accessory/serpentine belt for this model year, reinforcing that a drive-belt is fitted.

On this generation Legacy, the serpentine belt primarily drives the alternator and air-conditioning compressor. The model uses electric power steering, so there’s no hydraulic pump on the belt. The engines are chain-driven internally, so the drive-belt isn’t part of timing duties. It’s a simple, robust setup designed to keep electrics charging and the cabin cool while you’re out on the open road.

As with any EPDM serpentine belt, life depends on use and climate, but it’s smart to have it inspected at every scheduled service (typically every 12 months or 15,000 km in AU/NZ). Many belts run happily past 90,000–150,000 km, but condition trumps distance. If there’s noise, visible wear, or accessory performance issues, it’s time to act.

• What to watch for under the bonnet:
  • Squeal or chirp on cold start, especially with A/C on.
  • Cracks, fraying, glazing, missing ribs, or rubber dust around pulleys.
  • Intermittent battery/charge light or dimming lamps at idle.
  • A/C performance dipping at idle with belt noise.

• Service tips the workshop will follow:
  • Inspect belt, tensioner and idlers together