Pump is noisy, sounds like air in system, power steering went in and out after warm up, lost power steering at low speeds, returns as you increase speed. Replaced control valve and hose. Pump was replaced two months ago. After pump replacement it worked ok for short time. Pump seems to be getting very hot after short run.
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check power steering fluid level or for air bubbles in fluid, if low or bubbles found find and correct fluid leak. if fluid is ok most likely the pump is failing. Other possible causes are steering gear or linkage binding but are not very common problems.
If it is filled up to the "full hot" mark then you are okay, fluid wise. It almost sounds like once it gets warmed up, it starts running better. The "growling" noise (especially when turning) could be from it not getting enough fluid. Other than that, your power steering pump maybe on its last legs, and it is taking time to warm up before it starts pumping fluid correctly. Just make sure that you power steering resevoir is completely filled to the proper mark.
this sounds like a problem with the power steering system.it could be low on power steering fluid or you have air in the system that will have to be checked for leaks as air can be sucked into the system through the area of the leak.
YOUR VECHICLE HAS THE HYDRALIC BOOSTER.WHICH YOU POWER STEERING PUMP CONTROL BRAKING SYSTEM.CHECK POWER STEERING PUMP FLIUD LEVEL.IF LOW CHECK POWER STEERING PUMP HOSES FOR LEAKS.IF YOU FIND NO LEAKS.THE HYDRALIC BOOSTER OR POWER STEERING PUMP FAULTY.
Often, noise in the power steering is the result of air trapped in the system. It can also come from contaminated or worn out fluid. If the fluid level in the power steering reservoir is low, the pump will tend to whine and/or chatter. First, check the fluid level. If it is low, there is a leak somewhere. Keep the fluid level up if you must drive it, or the power steering pump will be destroyed. Once you have determined there are no leaks, or repaired any leaks you have have found, the best solution is to remove as much fluid from the system as possible, and then refill it with fresh, clean fluid. There is a product called Lucas power steering stop leak (or somesuch) which is excellent for quieting power steering components and extending their life. Use 1/2qt to 1 qt of regular fluid first, and then the whole bottle of Lucas when refilling. Top off with regular fluid as needed. Be sure to check the fluid level again after letting the engine idle and turning the wheels back and forth several times, as some air will be purged from the system and the level may go down substantially.
The fluid will show low when running because its circulating thru the system. Check it when its not running and cold, just like you would on the engine oil, you also might have to much in it is why its blowing out.