I had this very same problem on my 1995 villager. I recently read that the probable cause is a leak--sucking air into the system.Turns out this was the case: A 'bad 'elbow-shaped piece of connecting rubber hose, the piece which connects into the side of the Power Steering fluid reservoir on one end, and down onto a metal pipe, on the other. I tried tightening the clamps on this hose, while I found the underside of the hose, where it made its turn, damp with power steering fluid. I tried tightening the clamps and left it for a day to see if this would cure the problem. It didn't. So I took the hose off to examine it closely. (I syphoned the power steering fluid from the reservoir to just below the level of the hose in question first). Once the hose was off, I could see it was hardened with years of use. Anyway, after I had replaced it with a straight piece of hose formed into a bend, clamping one end of it onto the reservior & the other onto the peice of metal pipe below. it worked like a charm--no more squealing!!
Motorcraft MERCON ATF
The belt is tightened with an adjusting screw.
There is no power steering in a Mercury Villager at start up in cold weather due to a failing pump or low fluid. Fluid becomes much thicker in cold weather and is much harder to pump.
There are several sections of power steering hose on this vehicle, both supply and return. They run from the reservoir down to the supply lines to the steering rack.
on the front passenger side of the vehicle it is the pump that has the third belt n it
Loose or worn out power steering belt. A power steering pump going bad.
There is a loud squeak noise and it is hard to turn your car.
Into the power steering reservoir.
* No power steering fluid in reservoir * The power steering pump is not operating
You probably have an air lock in the pump. You need to take the pump apart and assenble the veins with vasoline so it will prime itself. GoodluckJoe
Check your power steering fluid or your fan belt could be making noise.