Does the belt turn the power steering pulley, I guess if it didn't it would make a racket.
With engine idling, cap off power steering reservoir, wheels turned one way or the other, can you see fluid swirl? If not maybe faulty power steering fluid lines or blocked.
I can't rule out the pump at the moment or the rack.
On some makes and models, I can take the belt off the power steering, engine off, of course, take return line loose, aim into catch pan, rotate pulley with my finger and fluid will circulate. The return line is a low pressure line usually held on with hose clamp at the pump. The high pressure line is a threaded fitting.
All that talking and I didn't tell you much? lol
SOURCE: 2005 chevy impala power steering leak problem
What you hae to do is check if the reservoir is leaking first if okthen it is either the piping or the steering pump. It is a process of elimination, you may need to clean the area first to discover where the leak is or work back from the point it is leaking on the belt. Until you identify where the leak is coming from it will be dificult to repair unless you just start to replace the pump and reservoir any way.
SOURCE: 05 impala steering noise. Rack or Power steering pump
the power steering fluid is probly the first thing u should check if that doesnt fix it replace ur fluid pump,.the resevior should be right around ur brake booster and master cylinder,.hope u fix it and find it
SOURCE: chevy silverado power steering
The power steering pump shaft may have broken inside the pump. I have seen this happen on a these trucks. Have your pump checked.
SOURCE: FUEL PUMP MAKES NOISE PRESSURE GAGE READS 40 PSI
Fuel pump is bad. At idle pressure should read 50 PSI. Replace with original manufacture fuel pump after market pumps will burn out fast and are unreliable from my experience. Also could have a bad fuel regulator but that only works while driving down the road full throttle. You can unhook the fuel rail pressure regulator and that will give it full fuel and the pressure reading should read 60 PSI while it is running. If you turn the engine off and turn the key to run position it should read 50 PSI and hold for 60 seconds, if it drops below 30 PSI after 30 seconds Pump is defective. Many pumps are going bad here of late as people have been running them less than ¼ tank and this kills the pump. The fuel cools and lubricates the pump so the lower the fuel level the worse it is on the pump below ¼ tank. Not to hard of a job to do if you want instructions let me know.
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