Symptoms
- Power steering fluid appears foamy, bubbly, or milky instead of clear
- Whining or groaning noise when turning
- Steering feels less responsive or slightly jerky
Likely causes
- CommonAir trapped in the power steering systemAir can enter after a fluid top-off, a repair, or a low fluid level, causing foaming.
- PossibleWater contamination from a leaking reservoir cap or sealWater mixing with the fluid causes a milky appearance and can damage internal components over time.
What to do
- Check the fluid level and top it off if low, since a low level is a common cause of air entering the system.
- With the car in park and engine running, slowly turn the wheel lock to lock several times to help work air out of the system, then recheck the fluid.
- Inspect the reservoir cap and seals for any sign of water intrusion if the fluid looks milky rather than just foamy.
- If foaming persists after bleeding, or if fluid looks milky, have a mechanic inspect the system further.
- Flush and replace the fluid if contamination is confirmed.
Tools and parts
- Power steering fluid
Power steering fluidSearch: “power steering fluid for [your car model]”
When to call a pro
If bleeding the system doesn't clear foaming, or if fluid looks contaminated, have a mechanic inspect for a deeper issue like a reservoir seal leak.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.