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i have a 2003 model mazda protege BJ, im losing water from the overflow bottle, but the guage never seems to go up, there is always water in the radiator & doesnt appear to have any leaks in the hose or bottle itself.

One point to note, the water gets bubbliing hot in the overflow bottle, any help on this would be welcomed

^^yh radiator cap badd ......it not sealing properly and is realeasing the pressure ......change the cap on yh on!!!

had that problem already and could tell from experience lol

ok, seems like an option i can try. will post result, thank you