Question about 1999 Subaru Legacy

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Power steering pump noise and loss of fluid - 1999 Subaru Legacy

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More then likely you will need to replace the power steering pump, unless it is a line leak, if it is the lower pressure then its just a hose and a clamp. The high pressure it the one that is a little more expensive as it has to be clamped. I would suggest wiping everything dry and filling it up and seeing where it is leaking from. Hope this helps tim

Posted on Aug 28, 2010

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Sudden Loss of power steering whilst driving. No symptoms, noises, etc. before hand. Power steering fluid level is normal.


is the drive belt of the power steering pump intact, if the loss of assistance was immediate and the fluid level is okay it is almost certain you have lost the belt , or the tension in it has drastically dropped

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So hoses are good. No leaks. No loss or consumption of fluid. No odd noise when turning yet no power steering! Bad pump?


not necessarily-- there are valves in the steering box/rack that bypass the oil when the wheel is not turned. These could stuck
Before you buy a new power steering pump have it tested by an accredited steering specialist shop to ensuring that you are replacing the faulty item.

Feb 14, 2015 | Cars & Trucks

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My power steering is out what can be the problem


Usually the power steering pump is the most likely culprit. Check you power steering fluid level. If it is good and there is no power steering, then the pump is probably not pressurizing the system. It is doubtful that the fluid has leaked out entirely as most power steering pumps are lubricated by the fluid and total loss of fluid would result in a terrible shrieking sound and almost certain pump destruction. Other causes could be a bad or leaking rack. Look for leaks at the rack boots.

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Check your power steering fluid level. Also inspect for leaks and the condition of the belt that drives the power steering pump. Could be a loose or damaged belt, loss of fluid and air in the system, or you pump might be going.

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Can low steering fluid cause mechanical problems


Problems associated with low power steering fluid…

Hard Vehicle Steering
A low power steering fluid level can often times cause a vehicle's steering to become hard and labored. Adequate amounts of power steering fluid are necessary to enable a vehicle's power steering system to function and operate at optimum levels. A lack of power steering fluid in a vehicle's power steering system reduces the amount of hydraulic fluid pressure necessary to efficiently operating the various parts of the entire power steering system. Power steering fluid supplies the fluid force needed to operate the power steering gears and to enable power steering gearbox operation. Low power steering fluid levels reduce this hydraulic pressure, which commonly results in hard vehicle steering.

Pump Noise
It is very common for a low power steering fluid level to cause significant power steering pump noise. An adequate amount of power steering fluid is required to ensure the proper function and longevity of a power steering pump unit, which is a belt-driven pump responsible for housing and circulating power steering pump fluid. A low level of power steering fluid results in increased power steering pump friction, heat, and wear, all of which can significantly reduce the operational life of the power steering pump while at the same time cause excessive power steering pump noise.

Fluid Boiling
Many times a low power steering fluid level can result in excessive heating of power steering fluid, a condition that can seriously degrade the fluid and cause it to boil. A low power steering fluid level results in less available fluid to both lubricate and cool a power steering pump unit. A lack of power steering pump lubrication and cooling leads to excessive heat being generated within the power steering pump unit itself, a condition that translates into the available level of power steering fluid becoming super-heated and degraded. When this happens it is common for the power steering fluid to boil and lose all of its lubricating and heat-reducing capabilities.

Gearbox Wear
The power steering gearbox is a set of gears within a vehicle's power steering system designed to facilitate movement of a vehicle's front wheels. The power steering gearbox is connected to the power steering pump by hydraulic fluid lines that deliver a constant supply of power steering fluid to the power steering gearbox. A low power steering fluid level, especially a chronic and severe low power steering fluid level, can lead to increased friction and wear within the power steering gearbox assembly, a condition that can significantly shorten the operational life of the power steering gearbox and negatively affect its operation

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some power steering system is computer control. if you disconnect battery the control module have to be program.the control module uses vechicle speed sensor and steering wheel rotation sensor.to operate an actuator in the power steering pump to control pump pressure and steering assistance.

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