Coolant question

Hi all



So, last week I noticed that my coolant had dropped a little. Not much...maybe 1 or 2cm. Looked around the car and no signs of leaks, oil is clean so my first thought was whether it was the cap.



Ordered a new one and fitted it today. Drove for 30 mins and when I checked the levels the coolant was 3/4 of the way up the tank.



Does this suggest the new cap is rubbish?

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