I need a little bit of advice.
My 1966 Mustang 289 Has power steering and it seens to work fine until it is hot (After 1HR) Then it gets a bit firm , still working just a little stiff.Could this be the Control valve or RamCylinder.
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YOU HAVE AIR IN THE POWER STEERING SYSTEM.YOU NEED TO BLEED POWER STEERING PUMP FIRST BEFORE DRIVING VECHICLE.CHECK POWER STEERING FLUID LEVEL ADD MORE POWER STEERING UNTIL REACH FULL COLD MARK..RAISE VECHICLE FRONT WHEELS OFF THE GROUND.START ENGINE LET IT IDLE WHILE TURNING STEERING WHEEL LEFT TO RIGHT NON STOP DONT LOCK OR STOP STEERING WHEEL KEEP TURNING IT SEVERAL TIMES CHECK POWER STEERING FLUID IF LOW ADD UNTIL YOU GET COLD MARK ON DIP STICK DONT OVER FILL POWER STEERING PUMP BLOW A SEAL.IF POWER STEERING FLUID LOOK TAN COLOR SYSTEM FULL OF AIR.TURN OFF IGNITION LET CAR SET FOR A WHILE CHECK FLUID LEVEL.IF STEERING WHEEL FEEL STIFF HARD TURNING DONT DRIVE CAR UNTIL YOU HAVE NORMAL STEERING.IF STILL HAVE AIR IN SYSTEM BLEED SYSTEM UNTIL AIR IS OUT.
It will probably just sit there when you start the engine, then take off like a rocket when you touch the steering wheel? The wheel will take off in the opposite direction of the way you tried to turn the steering wheel. (you start to turn the wheel to the left and it rips out of your hand and goes right until it slams the full right stop, then rockets back to the left until it hits the full left stop and shoots back to the right again and repeats this process until the engine is shut off.)
If this is the case, you have the hoses from the control valve to the power cylinder reversed.