Don't over-tight that hose. GM used metal "spring type" fuel clamp or nylon clamp because that won't crush the soft rubber.
Fill after a flush then do not use 50/50 mix.
See my Cave, Coolant Fill
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)