you power steering fluid may be low, if that was the case then you would have lowerd hydrolic power to steer the wheels and have to compensate by using more force...which may be why your steering is stiff.
If the power steering fluid leaks out the steering would become very stiff, and perhaps "lock" if the car were parked.
I was looking at the 1999 Ford Escort Owner Guide ( for North America ) It shows that Motorcraft MERCON automatic transmission fluid is used as the power steering fluid So , the answer would be ( Yes )
Not sure what your are driving but if it went stiff steering in both directions I would say either p/s belt fell off or the p/s pump is shot. Be sure the system is flushed if the pump is replaced.
The reservoir should be next to the wash fluid tank. This would be on the passenger side close to the firewall.
Could be low on ps fluid (leak), the drive belt is loose or the pump is failing. The year, make and model info would help.
If it was ordered with power steering it would have it.
* No power steering fluid in reservoir * The power steering pump is not operating
to my knowledge there is no power steering filter i would check my power steering fluid level
From what I understand, power steering in cars (vehicles) is simply to make steering the car easier. If it were not for power steering, you would have to use a lot more muscle to turn the steering wheel than you use when you have that power steering in place!
water will splash on the belts [power steering, alternator, etc.], causing them to slip, as if greasy, not turning the pulleys. get new belts.
There is probably air in the system. If the system was worked on for any reason, the sytem has to be purged of any air pockets.