This morning I found a small square of anit freeze under my car. I have a 2003 vw passat.
FYI - About two months ago I had the waterpump and thermastate replaced.

Keep a close eye on the coolant. If the problem persists, the radiator may need to be replaced, due to phosphate scale blocking passages. In the future, only use a 50/50 mixture of VW-recommended antifreeze and distilled water. Otherwise, only buy prediluted antifreeze.

Verify that the cooling fan operates properly. This link, as well as several others in the General Automotive section of the Sticky, should help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post235973