Shocked to find out with my first oil change I had a slight leak in my radiator. Has anyone else experienced this?

I have smelled what I thought to be coolant but I was assured there was not an issue. I had the dealer note it in my file just in case.

03.5 Sedan/B. Silver/Prem/Winter/Aero/Tint/Rims
69 Chevelle Hard Top BB/4.11's/Posi