Parts for your 2005 Subaru Impreza-Drive belt

2005 Subaru Impreza drive-belt: what it does and when to replace it

Technical sources including the 2005 Subaru Impreza Owner’s Manual, the Subaru Factory Service Manual (FSM) for EJ-series engines, and major belt catalogues used by workshops confirm this model is fitted with accessory drive-belts. On these engines, the drive-belts run the alternator, power steering pump and air-conditioning compressor. The engine’s water pump is driven by the internal timing belt, not by the external accessory belts.

On a 2005 Impreza (2.0 or 2.5, including WRX), there are typically two ribbed drive-belts under the bonnet: one for alternator/power steering and a separate one for the A/C. Their whole job is to keep the battery charging, the steering light, and the cabin cool. If a belt slips or fails, the battery may stop charging, the steering can get heavy at low speed, and the A/C may fade—none of which is fun on a busy arvo.

As part of regular servicing, the belts should be inspected for cracks, fraying, glazing (shiny patches), missing ribs, and edge wear. Belt tension and alignment matter too, a belt that’s too loose can squeal and slip, while one that’s over-tight can punish bearings in the alternator or idler pulleys. Most workshops in Australia and New Zealand will check these at each service interval.

Replacement timing varies with climate and usage, but a practical rule is to inspect every service (around 10,000–15,000 km or 6–12 months) and replace the drive-belts roughly every 60,000–100,000 km, or sooner if there’s visible wear or noise. If one belt is tired, it’s smart to replace both and look over the tensioner and idler pulleys at the same time.

• Listen for squeals or chirps on cold start or when turning the wheel at idle.
• Watch for the battery warning light, dim lights, or heavy steering.
• A/C slipping at idle can point to a worn or glazed A/C belt.
• Avoid “belt dressings”, they can mask problems and attract grime.

DIYers with a decent spanner set can usually swap these belts without drama, but space is tighter on models with A/C and on turbo variants. Using quality OEM-equivalent belts and setting proper tension will keep the Impreza happy for many more kilometres.

Popular questions

Does a 2005 Subaru Impreza use a single serpentine belt or multiple belts?
Most 2005 Imprezas use two accessory drive-belts: one for the alternator/power steering and a separate one for the A/C. The engine’s timing belt is a different, internal belt that drives the camshafts and water pump.

How often should the drive-belts be replaced?
Have them inspected every service (about 10,000–15,000 km or 6–12 months). Many owners replace them around 60,000–100,000 km, or immediately if there’s cracking, glazing, noise, or charging/steering issues.

What are the signs of a failing drive-belt on a 2005 Impreza?
Squealing on start-up, chirping when accessories load up, visible cracks or frayed edges, battery light on the dash, dim headlights at idle, heavy steering at parking speeds, or weak A/C cooling at idle are common clues.