Hey, thanks! I've been round the garage to get the system pressure tested. There is a hairline crack on the plastic housing, there you have it!!! Now the question is, do i use "Insta-Seal Permanent Block & Radiator Seal" (a fluid that i can pour into the radiator with the hope that it'll fix my problem or do i change the radiator all together?? Even if i do change the whole radiator, do i go for OEM or a cheaper equivalent from euro car parts, either manufactured by Nissens or EIS Germany which are said to be just as good. Any thoughts...???