transmission coolant line keep popping lose

[trout71]

I just replace my return line for the transmission line coolant put it keeps coming pop loose on the coolant side. how can I fix it?

 

[Mike L.]

Maybe you should have a professional install it. Pretty easy.

 

[TheBac]

Absolutely sure you've got the retaining clip seated properly? All three if the little pips are showing thru the holes in the outer fitting?
It takes a bit of force to pop the lip of the line past the clip until it "clicks". On my daughter's Cruze, I used a very small, very light coat of dielectric grease on the cup part of the hose fitting to get it to slide past the clip easier.