Thank you all, I too had decided to free the fan it is the plastic version and see if that's the trick To bore you all this all started as at the MOT it was suggested that perhaps the rad bottom tank looked suspect, so wife says change it! After its out it will go to Exeter Radiators and if its actually checked ok etc I will offer it for sale. I still have to manage flushing the block, without I hope "popping core plugs" Thanks again