a fortnight after fitting new rad the blinking problem has returned again. the mechanics said they have tested the head, all fine, tested cooling system, holding fine. its had new rad,exp cap, water pump so they are at a bit of a loss.with best intentions they just cant pinpoint the problem. seems im left scratching me head again :0( they say poss try cutting supply to rear heater to see if the problem lies in the exchange from front to rear. the saga continues lol