Hello, i have a 1993 Discovery2.4 diesel and have only had it for 4 months, i have now encounted a problem of the power steering seeming to work only occasionally. It gets very hard when at lower revs and then as the revs increase gets slightly better but no where near what it should be. Does anyone know if this is a common fault and is it likely to be the power steering pump? The fluid is full and the belts are fine, if it is the pump any ideas how much and if they are a mission to change? Thanks or any help, will defiantely not go back to a car having now discovered the discovery, thanks