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deMort said:Not much i can add other than what's already been said ..
Check it when cold and top up if needed ( water is fine due to the shear volume of coolant it won't drop the antifreeze content by much ) it sounds like there was a small airlock which has now cleared ... not unusual shall we say and a bit difficult to predict ..
Some cars are fine after a job like this and others hang onto an airlock for a good few miles .
we tend to tell customers at work .. check it over the next few days until it settles .
Obviously never open the cap with a hot engine .