Anti-Freeze leak closer to the firewall

I have recently started smelling antifreeze when I would get out of my van. Then the beginning of this week I noticed in my garage I had a puddle of antifreeze on my floor but it was kinda a sticky substance but smelled like anti-freeze. My car is not heating up and the heat is still working. Does anyone have an idea of what it is? I just had my oil changed on Sunday and they did not say anything was wrong. Should I worry.:uhoh: