1999 Chevy Suburban White smoke smells like anti freeze out

Ifust changed my radiator and now Im getting clouds of white smoke out of exaust didnt do that before?
The reason I changed the radiator it was leaking out the drivers side where the fins meet the side. I can see some steam in the throttle body when i turn the truck off and hear a little hissing sound inside when i open the throttle. after a several minutes everything stops no smoke and engine runs fine.