What would happen if i put too much antifreeze in my car?

i just got my car back from garage after fixing my radiator fan because the relay switch was broken so they had to drain my water out. i just had a look at the reservoir tank and it was'nt up to the max line so i just topped it up only half a litre of antifreeze so i can get it to the max line. the thing is the... show more i just got my car back from garage after fixing my radiator fan because the relay switch was broken so they had to drain my water out. i just had a look at the reservoir tank and it was'nt up to the max line so i just topped it up only half a litre of antifreeze so i can get it to the max line. the thing is the garage has already put 2 and a half litre antifreeze in my car. is it still safe to drive or will i have to drain some out, i am thinking about letting it go down on its own. i hope that will be ok. thank you for any feedbacks i get
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