I'M HAVING ISSUES WITH MY POWER STEERING WHEN I TRY TO TURN A CORNER

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I TRY TO TURN AND ITS REALLY HARD TO UNLESS I USE THE ACCELERATOR THEN IT LOOSENS UP BUT THATS THE ONLY TIME ITS EASY, MY DAD SAID THE PUMP MAY HAVE A LEAK BUT THERES NO FLUID DRIPPING ON THE GROUND, MAYBE THE POWER STEERING HOSE? IT'S AN 03 POLICE INTERCEPTOR BTW