thanks for all the reply's ill look into it all. well im not sure if it could be head or not. 1 there is no excess pressure in the cooling system, 2 there is no trace of exhaust gas in the reservoir. 3 car is running perfectly normal in temp range. I just went over all the radiator hoses to find the top left hose (10-15mm) in diameter loose with water marks running down it. will drive around for a couple of weeks and see if it has coolant level has droppped. tomorrow if I have time ill pull the plugs out and inspect them to see if its detonating with water in the chamber. also the car has a bit of a rough idle. its done 104000 now. and on the last service was at 93,000 for plugs. did oil last weekend. :-)