Parts for your 1999 Subaru Forester-Power steering pump

1999 Subaru Forester Power-Steering Pump — What it does and how to look after it

Yes, the 1999 Subaru Forester is fitted with a hydraulic power‑steering pump. This is confirmed by technical references including the Subaru Forester (SF, MY99) Factory Service Manual Steering section, Gregory’s Subaru Forester 1997–2002 workshop manual, and OEM parts catalogues for the SF-series Forester, which list a belt‑driven power‑steering pump assembly for the EJ-series engines. It’s not an electric assist system, it’s a traditional, engine‑driven hydraulic setup feeding a rack‑and‑pinion.

The pump’s job is simple but vital: it pressurises fluid so steering effort stays light at parking speeds and consistent on the open road. When the pump gets tired or the fluid is old, owners may notice a whine under the bonnet, a groan at full lock, heavier steering at idle, or aerated/foamy fluid in the reservoir. Left unchecked, a weak pump or contaminated fluid can shorten the life of the steering rack and hoses.

As part of routine servicing on a 1999 Forester, it’s smart to give the power‑steering system a once‑over. Subaru of this era specifies ATF Dexron III‑type fluid for the power steering, not a generic PSF. Many Aussie and Kiwi workshops freshen the fluid every 60,000 km or 2–3 years, especially if the car tows, does lots of city work, or shows any noise on cold starts.

• Check fluid level and colour, top up with the correct ATF if low and investigate leaks.
• Inspect the drive belt for cracks or glazing and set proper tension.
• Look for seeping at the pump shaft seal, hose crimps and the return hose clamps.
• Listen for whine or groan while turning, a common Subaru quirk is air ingestion via a hardened inlet O‑ring on the pump—cheap to replace and often cures cold‑start whine.

If replacement’s on the cards, most home mechanics can manage it with basic tools: relieve pressure, remove the belt, cap the lines, swap the pump with new sealing rings, refill with fresh ATF, and bleed by turning the wheel lock‑to‑lock (engine off, then on) until bubbles clear. If there’s metal glitter in the old fluid, budget for a more thorough flush and a filter in the return line to protect the rack. After fitting, recheck belt tension and fluid level over the next few drives—the system can burp a bit of air as it settles.

What fluid does the 1999 Forester use in the power steering?

Subaru specifies ATF meeting Dexron III for the power‑steering system on the 1999 Forester. Using the correct ATF helps prevent pump noise, seal shrinkage and premature wear. Avoid mixing in generic “power‑steering fluid” unless it explicitly states Dexron III compatibility.

How can someone tell the pump is failing on a 1999 Forester?

Typical signs include a whining or groaning noise that follows steering input, heavier feel at low speed, foamy fluid in the reservoir, or leaks at the pump. Cold‑start whine that improves as it warms can point to a hardened inlet O‑ring drawing air, if a new O‑ring and fresh ATF don’t settle it, the pump may be worn.

Can the power‑steering pump be rebuilt, or is replacement better?

Minor issues like the inlet O‑ring and external seals are often worth fixing in situ. If the pump has shaft play, consistent noise, metal‑filled fluid, or poor pressure, a quality remanufactured or new unit is usually the best bet. When replacing, always fit new sealing rings and refresh the fluid to protect the rack.