why is my truck leaking coolant/anti-freeze? on 2004 Chevrolet Trailblazer

my 2004 chevy trailblazer was leaking coolant so I figured since I had a big hole in the top of my resivoir that it needed to be changed so I bought a new one and got it put in but its still leaking from the same spot(the back, there is a hose in the back of the resivoir) I don't know what IS causing it. the old one was not hooked to anything so I didn't hook this one up to anything. any suggestions????? it happens all the time, it don't matter if the truck is running or not it still drips out.

Asked by for the 2004 Chevrolet Trailblazer
2 answers 2 comments
pressure test cooling system
Ok thanks
have your mech pressure test cooling system
Ok thanks