Yeah,right I think - if the small valve in the centre of the cap is faulty it won't allow coolant back into the radiator,and a common symtom is squashed hoses as there is a vacuum in the system.Natural laws always follow the easiest route - so if there is a leak in the system then it will draw air from there instead of the more difficult task of dragging coolant back from the tank.So you can have a vacuum air leak that doesn't show up as a coolant leak even under pressure,it's easier to pass air than water through the gap.
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