as others mentioned, it's most likely spilt coolant during the replacement process. they shouldve hosed down the engine bay afterwards to remove all thd spilt, sticky smelly mess - because it's coolant it wont evaporate like plain water so it just has to be washed off.
could be a chance some coolant is leaking in your heatercore? can you put the cabin air intake to recirc and see if the smell subsides?
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