update
i brought myself the service manauls for 5 series from amason the bentley publlishre one you get 2 manauls from these i have found out that it was the general modual its under the glovebox gm111 that needed replaceing i got one from the breakers for 50 +vat and all the cental locking works and the rear windows the 50 amp fuse that had blowen was for the fan it knacked so another job to do but as it is a deisal and the temp is running normal i think i will leave it for the time being if i had a petral engine they run a lot hotter so it might have started to over heat