Parts for your 1998 Subaru Forester-Power steering pump

1998 Subaru Forester Power-Steering Pump — What It Does and How to Look After It

Yes, this model absolutely uses a power-steering pump. The 1998 Subaru Forester (SF series, EJ engines) is fitted with a belt-driven hydraulic power-steering pump, as outlined in the Subaru Factory Service Manual for SF Forester models, Subaru OEM parts catalogues for 1997–2002 Forester, and workshop manuals such as the Haynes/Gregory’s guides covering Subaru Impreza/Forester of the same era.

On a ’98 Forester, the power-steering pump’s job is to pressurise ATF-based hydraulic fluid and send it to the steering rack, so the driver gets light, predictable steering at parking speeds without losing road feel at cruise. It’s spun by the accessory belt, so pump health goes hand-in-hand with belt condition and tension.

Good maintenance goes a long way. Subaru specifies ATF (Dexron II/III) for the power-steering system in this generation. It pays to check the reservoir dipstick markings (COLD/HOT) and keep the level on point. If the fluid looks dark, smells burnt, or foams, it’s time for a change. A simple drain-and-fill helps, but a gentle flush with fresh ATF usually restores feel and quietens the system.

• Inspect the drive belt for glazing, cracks, or slack and adjust/replace as needed.
• Look for leaks at the pump shaft seal, hose crimps, and the suction hose O-ring (a known Subaru trouble spot that can cause whine/cavitation).
• Avoid holding the steering at full lock for more than a few seconds, it overheats fluid and stresses the pump.

If replacement’s on the cards, choosing a quality new or properly remanufactured pump is worth it. Fit a new suction O-ring and consider fresh return/pressure hoses if they’re weeping or hard. Typical steps are to disconnect the battery, relieve belt tension, drain the reservoir, cap the lines, swap the pump, torque the brackets to spec, refit the belt, and refill with the correct ATF.

Bleeding is straightforward: with front wheels off the ground, fill to the COLD mark, start the engine and slowly turn lock-to-lock 10–20 times without dwelling at full lock, topping up until bubbles disappear. After a short drive, recheck for leaks and set the level to the HOT mark if applicable. Done right, the Forester’s steering stays light, quiet, and confidence-inspiring for many more kays.

What fluid does the 1998 Forester power steering system use, and how much?

Subaru specifies automatic transmission fluid meeting Dexron II or Dexron III for the power-steering system on this model. A basic refill typically takes around 0.8–1.0 litres, but allow a bit extra if you’re performing a gentle flush to clear old fluid and air. Always check the reservoir dipstick (COLD/HOT marks) and adjust level accordingly after bleeding.

How can someone tell if the power-steering pump is failing?

Common signs include a whining or groaning noise that rises with engine speed, heavier-than-normal steering effort at low speeds, fluid leaks under the bonnet, or aerated/foamy fluid in the reservoir. On Subarus of this era, a tired suction hose O-ring can mimic pump failure by letting air in, so it’s smart to replace that seal before condemning the pump.

What’s the right way to bleed the power-steering system after pump or hose work?

Raise the front wheels, fill the reservoir to the COLD mark with Dexron-spec ATF, start the engine, and turn the wheel slowly from lock to lock 10–20 times, avoiding pauses at full lock. Top up as bubbles dissipate. Lower the car, road test gently, then recheck and set the level. If noise persists, repeat the process and verify hose clamps and the suction O-ring are sealing properly.