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Have a 1999 Silverado 4x4 Ext. cab. Power steering hard to turn. fluid o.k., belt looks fine& no leaks. Also sounds like vacuum leak behind steering column when making a sharp turn at low speed. Noticed engine idle @ 500 RPM, Too low??
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your power steering pump may be failing, the system is restricted check for clogged filter and check pump pressure, the steering gear (box or rack) may also be binding, check also for worn ball joints or bent links.
This sounds like the hydroboost unit is leaking.behind the master cylinderThe braking system on this using the power steering pump to provide power assisted brakes instead of a brake booster. The hydroboost unit most likely needs replaced.
sounds like the power steering pump is the problem. check the drive belt for proper tension and if that looks fine - then replace the pump.
the reason it only works when you step on the gas is because the pump is moving faster then at idle. which is why I think it could just be a loose belt. but again - if the belt looks good and tight, then the pump is bad and needs replacing.
2004 chevy tahoe 4x4 had the same problem wont turn right at idle - like no power steering , has hydoboost brake steering system , did test and found steering box bad , removed box and remove the top cover on box 4 bolts at hydralic cover and removed and found spool valve has 4 seals 1 outer was blown i replaced box with reman from advance auto about $200.00 and flushed system , drove great problem solved .
Add power steering fluid, have some one start engine, and turn wheel as far as it will go, that will put pressure on power steering pump, now you can look for the leak, while it's under pressure, good luck.Hope this was very helpful.
While the engine is running look in the reservoir and see if the fluid is flowing.If you can`t tell then remove the belt and pull out on the pulley.What will happen on some of these is the pump steering shaft will sheer off.It will still stay in place but it is not turning anything.Hope this helps.Good luck.
Is there a large puddle under your vehicle? Your car's power steering is powered by power steering fluid and the belt turning this pump. So either you ran out of fluid due to a slow leak, the belt is not turning the pump, or you have a large leak and you lost all of your fluid at one time. It would be a good start by checking the power steering fluid, and the belt.
check your power steering fluid level
check the power steering belt tension
check the hosesto see if they are restricting the flow of power steering fluid
try bleeding the systek to see if there is any air in the system
try changing the power steering fluid as it may not be the rite fluid for your car
perhaps you have a defective power steering pump or the seals in it are going
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