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Re: 2004 4.2 ltr envoy power steering stopped working -...
Most likely the power steering pump is your problem. It sounds like the shaft inside the pump has broken and it is not pumping fluid. I would install a new pump and see what happens. The other option would be the rack and pinion (steering gear). The power steering pump is the cheaper of the two and usually the problem. I hope this helps you.
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Hmm.. Low fluid in the power steering pump, broken belt driving the power steering pump, failed component causing loss of power steering fluid, failed power steering pump.
Check for a broken belt first, check the oil in the pump, look for leakage under the truck.
If the pump is low on fluid you want to put about half the amount in that you're going to need and then start the truck and turn the wheel slowly from stop to stop, each way- spend about ten seconds going from one stop to the other. This will allow any air in the system to be purged out in a controlled fashion, it can really spray if you get a big, compressed bubble of air in the system and release it quickly. Shut the truck off and top the steering pump up, check for leaks.
YOU HAVE A RUPTURE PRESSURE LINE IF YOU HAVE NO POWER STEERING FLUID IN THE POWER STEERING RESERVOIR.LOCATE LEAK THEN BLEED POWER STEERING SYSTEM BY ADDING POWER STEERING TO RESERVOIR.DONT OVER FILL BY FULL COLD MARK ON POWER STEERING DIP STICK.ADD FLUID TO RESERVOIR WAIT A 2 MINUTES.CHECK FLUID LEVEL AGAIN.WHEN POWER STEERING FLUID LEVEL STOP DROPPING.START ENGINE LET IT RUN FOR 10 SECONDS.THEN TURN OFF ENGINE CHECK POWER STEERING FLUID ADD FLUID IF FLUID LEVEL DROPS. WHEN FLUID LEVEL STOP DROPPING.SAFELY RAISE SUPPORT VECHICLE FRONT WHEELS.START ENGINE.NOW TURN STEERING WHEEL GENTLY FROM STOP TO STOP MEANING LEFT TO RIGHT DONT HOLD IN POSITION.LET THE STOP TO STOP BE QUICK.CHECK POWER STEERING FLUID AFTER YOU HAVE TURN STEERING WHEEL ABOUT 7 STOP TO STOP.WHEN FLUID LEVEL STOP DROPPING YOU AT HOT MARK ON DIP STICK BLEEDING PROCESS COMPLETE.TURN OFF ENGINE LOWER VECHICLE BACK TO GROUND WAIT ABOUT 5 MINUTES CHECK YOUR FLUID LEVEL.IF FLUID LOOKS LIKE A TAN COLOR.YOUR POWER STEERING SYSTEM FULL OF AIR.TURN OFF VECHICLE LET VECHICLE SET A LONG WHILE TO AIR BUBBLES SETTLE DOWN LOOK FOR LEAKS AROUND POWER STEERING PUMP FRONT SEAL AND CHECK FOR LEAKS AROUND POWER STEERING LINES.
It all depends on where the fluid is coming from. It could be a ruptured pressure hose, or a seal in the power steering pump. The 2 "dangers " are NO POWER STEERING and burning out the pump with no fluid. A short drive for repairs using " ARMSTRONG " will probably do no harm. Hope this helps