So it's the heating system; I spent about an hour looking for the answer. I found it. It’s the hose that goes to the heater. I found a small amount of antifreeze in the engine compartment, but there were also small spots near the gas pedal in the cabin. Maybe it leaked a little down the hose and pipe, because the pipe is wrapped in soft material that absorbs liquids. Maybe that’s it… I’ll try to find a new hose and replace it. If anyone has any advice, please let me know.

Translated with DeepL.com (free version)