While working on many different vehicles...
Cut my hand on the exhaust manifold heat shield once. Burned my hands on the exhaust manifold lots of times! Many scraped and bruised knuckles when the wrench broke loose.Car door slammedshut on my hand when I was a kid. Got my hand stuck while working underneath. Lots of scrapes on my arms from various parts. Also, don't know if it counts, but had washer fluid squirted into my eyes from someone who decided to "test" the new windshield wiper blades, right after I finished putting them on. Didn't know I'd need a full face shield to change wiper blades. lol

 

i found a small hole with a grommet extremely low on the firewall (was behind the carpet on the drivers side) i'm unsure if GM or someone else put the hole there. but something you can look for.

 

Thanks Couch, but I actually managed to squeeze it through an existing grommet/plug deal that GM decided the '06s needed, a real pain in the *** and a tight fit, but it worked out.