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older model altima need drive belt tension adjustment at 7500 miles intervals, the new models altimas has a automatic belt tensioner.i you hear noises belt tensioner could be failing.or could have leaking coolant getting on drive belt due to water pump gasket leaking or pump leaking.or alternator power steering pump could be failing many things will cause drive belt to make high squeak noises.
no noise when turning and stiff steering is usually narrowed down to 2 things. a bad power steering pump or bad rack and pinion assembly. the rack and pinion is most of the time leaking fluid when it is bad, but you stated the fluid is good. I suggest to remove the power steering reservoir cap , start the engine and look inside the reservoir. the fluid should be swirling if the pump is working especially when turning the steering wheel. if the fluid isn' t moving then the pump is most likely bad.
it is hard to say over the internet but check the resovoir bottom for the power sterring and see if there is fluid in there . If not the items that usually leak on that model car is the high pressure power sterring hose which you will see on top next to the firewall, the return hose and the pump itself but it is hard to tell which one because the return hose attaches to the pump and if leaking would make it look like it is the pump.
the steering wheel gets stiff, because the car died and your power steering pump is stopped. beeing a 1994, you may have a fuel pump issue (nissan had campaign on those), but most likely no longer available to you, because of the age of the car. they purge campaigns out as years go on. you could have an issue with distributor. oil leaks pass the seal and gets inside of the distributor assembly on the signal plate (internal component of distribitor) and messes with the ignition system/spark plugs. you may also have a broken intake gasket. When was the last time you did a tune up?? changed plugs, fuel filter and so on???
if there is a leaking seal in the power steering rack and pinion or in the hydraulic pump, a power steering stop leak may swell the seal enough to stop the leak. if there is still a leak, it is likely a damaged / corroded line or fluid cooler. next time you need to top up your fluid, i recommend Lucas brand power steering stop leak / treatment. after a couple top ups it will stop the leak it if is a rubber seal problem. good luck!
If the pump is low or empty, the most likely cause would be the high pressure hose is leaking and needs to be replaced. If the power steering reservoir is full and the pump is still making noise then it could be the pump or a restriction in the rack valve body.