Hello recently braught a Range Rover 2004 had probelms with heaters being stuck on so changed the hedgehog then was working for 2 days then it's stopped working again could it have gone again or is it something else ?

Hello I have recently purchased a Range Rover 2004 3.0 diesel and I had heater problems on the second day of owning the car they was blowing full blast I have replaced the final resister (hedgehog) and it has been working for 5 days but now it's doing the same again the heaters are on all the...