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It really depends on what is wrong and needs "fixing"...The "Related Questions" below all relate to Taurus/Sable power steering systems, from pumps to draining fluids.Should be a good start...
I have the same problem on my 95 Sable LTS
Take it to a garage. It can leak at several places and there are seals that can be installed to stop the leaks.
how much would it cost on a 2004 mercury sable
Heater core.
There is no fixing a broken motor mount. Replace them with a new ones.
You will have to take it apart to determine why it's not working then you can fix it.
Physical damage to a cylinder is seldom repaired. More often the motor is replaced.
Change the mlps {aka} the nuetral safety switch or the selector switch on the transmission and that will fix the radio problem and the power steering problem it may have also.
I have a 1996 Mercury Sable and it did the same thing. The fix was a new transmission. My mechanic noticed that the car was running higher RPMs than it should have after replacing an engine that blew a rod through the engine because of the bad transmission.
I don't have an answere, but a picture diagram would help alot try going to "How stuff works"!
Your local auto parts store can help you with that.