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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.
there is a belt on the front of the engine that drives the various items like alternator, water pump, air conditioner and power steering pump-the power steering pump is the only accessory that has a reservior with a cap on it-look for it and turn the cap counter clockwise, it has a small dipstick on it. fill the reservior to the full level using the dipstick.
Sounds like the reservoir is overfilled. Take a turkey baster and siphon some out so that the level is at proper level. Then with engine running, rotate steering wheel slowly from one end to the other a few times. This will bleed any air bubbles that might be in the system.
If you have foam or bubbles in the tank its a sign of air in the system (airation). Air often enters the system when hoses or lines are replaced or disconnected. Its usually accompanied by whining of the pump when turning or parking. Often times this can be eleminated by removing the cap and turning the cars steering wheel at a moderate speed from full left to full right. Repeat as needed until problem is gone.
Pump condition depends largely on how much fluid had been lost and how long you drove it that way. Sometimes whine will continue for an hour or two, till all air has exited the system. If it continues for more than a day, yes, you will need to replace the pump.
The power steering fluid will aerate (churn and make bubbles) if the power steering fluid is overfull or underfilled.
If the steering is making a binding sensation, causing excess motor drag, then it's probably low.
Just go to auto parts store and buy their recommended fluid. It's about $3/quart usually. Some auto makers require very specific fluid for their cars, but for a Nissan, it should be somewhat standard.
There should be a dipstick that is marked with the proper fluid level on your power steering pump. It'll be marked HOT and COLD, which of course corresponds with when you're checking the fluid. If you haven't driven the car and it's morning time, check the level with COLD. If the car has been driven and is warmed up, then check it against HOT.
It sounds like the power steering hydraulic system has air in it, causing the pump to whine and the bubbles to show up in the fluid. The clicking noise is probably just the power steer pressure switch operating normally, but you should probably take it back in to the repairer and get them to check it over if you're concerned. They should not have given it back to you if the power steer was not bled up properly, or at the very least should have advised you that it was not fully bled, but would come right after a couple of days.