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Hello. Its not uncommon at all for the pump in those older fords to make noise. Even after replacing them. The re manufactured pumps are usually just as noisy as the pump they replaced. As long as your mechanic has properly bled the power steering system, There are a number of products that are useful for quieting the noise down. Lucas brand is what we always use for that particular pump. It works great. There are quite a few though that probably work very well.
If your car runs poorly when you turn on your AC, Try cleaning your IAC, idle air control. If cleaning it doesn't fix it then it may need to be replaced. When you turn on your AC, it puts additional load on your engine. The IAC helps compensate for this additional load by letting air bypass the throttle plate. If it's dirty or malfunctioning your car will run rough when you put additional load on the engine at idle.
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I have installed many of that particular pump and have seen it moan just as loud as the old one. Even after properly bleeding it. It's a known issue. I will let someone else have a shot at it in case im missing something.
The engine has a hard time when they turn as well as when turning on the AC? Have they looked into the IAC?. A malfunctioning idle air control is the likely culprit. The aftermarket pumps they installed are most likely rebuilt and just as old as the car itself.
It is an OE pump that has just been remanufactured. It is an original ford pump. For some reason that style pump often times tends to be noisy even after they rebuild it. I don't know exactly why but have seen it many times