Hi, could also be that your compreesor is playing up. Recently changed mine, listen to see if it makes an unusally loud or attling noise whilst pumping. Andy

Hi, just registered to try and save my sanity. I have a 1999 TD5 Discovery and rear passenger door will not unlock with the central locking, or when trying the handle. I have been told it has something to do with the individual actuator in the door, but can't for the life of me work out how to...