Steering hissing when at full turn - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 01-14-2011, 07:42 PM Thread Starter
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Steering hissing when at full turn

Im getting a hissing sound when I have my steering wheel turned all the way. For example when making a U-turn or a sharp right turn. It does it regardless of the outside temp or the temp of the motor. The hissing literally sounds like it is coming from behind the steering wheel. Is this normal? Has anyone every came across this? Thanks.

P.s. I replaced the power steering pump recently due to it going out and having a whining noise. The hissing noise has been happening for about 120,000 miles already.

1999 F-350 7.3L, 4x4, AT ,6.0L Cooler, 4" Pinnacle Performance straight pipe exhaust, Warn locking hubs, Edge Juice w/attitude monitor for gauges, SCT SF3 Tuner, BD Billet Wheel, 4" Lift kit, 35x12.50x17" Nitto Trail Grapplers with 17" x 9" Unique Soft 8 wheels, DIY Tymar intake, Zoodad mod
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post #2 of 3 Old 01-15-2011, 05:48 AM
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Power steering has a relief valve that lifts when pressures become too high. This will happen when wheels are turned to full lock. When it lifts it is normal for it to make a slight hissing sound.

late 99' F350, Crew cab, SRW, 4guage pillar pod, combo driving/fog lights, 55w backup lights, drivers side battery isolation mod,6637 intake
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post #3 of 3 Old 01-15-2011, 12:56 PM Thread Starter
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Ok Thanks. I wasnt sure if this was a normal sound.

1999 F-350 7.3L, 4x4, AT ,6.0L Cooler, 4" Pinnacle Performance straight pipe exhaust, Warn locking hubs, Edge Juice w/attitude monitor for gauges, SCT SF3 Tuner, BD Billet Wheel, 4" Lift kit, 35x12.50x17" Nitto Trail Grapplers with 17" x 9" Unique Soft 8 wheels, DIY Tymar intake, Zoodad mod
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