Thanks everyone for the help it looks as if my very cheap (£14) code reader isn't going to be any use on this. The temp is about right for my car (runs hot in traffic or if not on open road) but I have not noticed the side engine cooling fan starting up for ages.
Strange thing is the car is running exactly as it always has and I got it home after only 4 miles (to test it and warm it up) thinking it is going right.
A contact of mine (ex Porsche engine builder) in UK suggested that there are other green rubber items it may be; such as spark plug tube seals or 2 sump round cavity things and these can get broken up?
One of mine did have a leak and 2 tubes came out on the coils doing a spark plug change recently.
