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Follow the serpentine belt on the front of the engine. One of the accessories powered by the belt will be the power steering pump, It will have a twist off cap with a dipstick or a sight window to show the power steering fluid level. Don't overfill the reservoir.
the power steering reservoir is located at the front of the motor, when you are standing at the passenger side looking toward the drivers side,by the firewall side of the motor there should be a cap that when you pull it out it will have a dipstick that tells you what the level is in the reservoir,it will usually say power steering fluid on it.you check it with the engine off and there is a low level line and a high level line(full)with the motor cold it should be about half way between the low and high mark,when warm or hot it should be closer to the high mark.only use fluid for power steering
Locating the Power Steering reservoir and adding PS fluid. 1999 Pontiac GP
The reservoir is clearly visible in the engine bay on the 3.1 litre engine cars.
For the 3.8 Ltr engine cars,
use a flashlight to look down past the alternator for a black cap with a
steering wheel printed on it to indicate the power steering fluid reservoir. ( passenger side of the vehicle).
Remove the cap of the power steering reservoir, clean the
dipstick, re-insert and remove again to check the fluid level. If the
level is at or below the low level mark, add fluid slowly, taking care not
to fill above the MAXIMUM mark. It's best to add small amounts and re-check the level as you go to ensure you do not overfill the reservoir above the MAX level.
ONLY use the power steering fluid recommended for that vehicle by GM.
YOU NEED TO BLEED POWER STEERING SYSTEM BY HAVING LOW FLUID AIR ENTER THE SYSTEM.PARK CAR ON SOLID LEVEL GROUND SAFELY RAISE SUPPORT VECHICLE ON JACK STANDS.YOU CAN LEAVE CAR ON GROUND BUT TURNING STEERING WHEELS BACK AND FORTH WILL WEAR SPOT IN TIRES.TURN STEERING WHEEL TO THE LEFT WITH THE ENGINE OFF.CHECK POWER STEERING FLUID.ADD MORE FLUID IF LOW.MAKE SURE FLUID LEVEL ON COLD MARK ON DIP STICK.THE YOU CRANK CAR UP LET IDLE LITTLE HIGH FOR 15 SECONDS.THEN TURN OFF ENGINE.CHECK POWER STEERING FLUID LEVEL MAKE SURE ITS ON COLD MARK AT DIP STICK.THEN YOU START THE CAR UP WHILE IDLING TURN STEERING WHEEL IN BOTH DIRECTIONS SLOWLY TO THE STOPS DONT HOLD IN STOP TURN STEERING WHEEL LEFT AND RIGHT FOR SEVERAL TURNS.STOP ENGINE CHECK FLUID IF FLUID TAN STILL HAS AIR IN SYSTEM.LET CAR SET A LITTLE WHILE TRY THE BLEEDING PROCEDURE AGAIN.THERE IS A REASON POWER STEERING FLUID WAS LOW CHECK ALL POWER STEERING HOSES AT POWER STEERING PUMP TO THE RACK PINION ASSEMBLY.
If you have a warranty from your dealer, you paid for it, or whether it came with it, it doesn't matter, you MAKE them honor it. Take it back there, and MAKE THEM FIX IT! This shouldn't be your problem if you have a warranty. If they aren't honoring it, threaten them with the BBB or court. They will shape up. I would say power steering pump.First check to make sure there is fluid in the reserve tank and at the proper level if not top it off and whine should stop.If level is correct then maybe try flushing with fresh fluid. 3.8L engine the power steering fluid was never toped/checked.. because it is a pain in the *** to get at (behind the hot as hell alternator), so it probably ran dry, top it up is probably all you have to do.. if the whining presists then you will have to try and bleed the air out by jacking it up, engine off, turn the wheel one side to the other about 25 times.. if that dont quiet it up then you will have to replace the power steering pump. Power steering pump / fluid level is not hard to check - it is located below the alternator on the passenger side of the engine bay. You need a light to see it. You can get your hand down from the top of the engine to loosen and remove the cap/dipstick. Here is a link that should help you.http://www.paulstravelpictures.com/GM-Pontiac-Grand-Prix-GTP-Power-Steering-Whine/index.html Good luck and thank you for using Fixya