[dmarty]

Yup. You need a tool to release them. Looks like a fuel line tool only bigger. The GM special tool is J43181, but I think most any universal tool will work if it's the right diameter. Lisle makes a nice set of quick connect release tools that goes up to 7/8" dia and runs about $10. Don't remember what size the hose is, but that might work. It was so long ago for me, that I don't really remember what I used. I think I just cobbled something up to work.