on the mark 1, they are right hand side engine near block, as you look, not sure on the mk2 Hi Anadin Thanks for the info. I expect that it probably in a similar place...haven't been able to check it yet as I have damaged my back and am now flat out in bed for a while. Have you or anyone else had to change one? Is it reasonable easy and does the radiator need to be drained first? only partially drain, easy to do just fiddly, check your wiring to it for brittleness , regards