On a 4L60E, the repair manual states "simply unsnap the plastic collar from the quick connect fitting, then pry off the quick connect fitting retaining clip and remove the lines".

Does anyone have a pic of the retaining clip .
I certainly don't want to bugger up this connection .

 

Its a small horseshoe looking clip.Use a small pick to remove or they make a tool that works alittle, to raise it up while you pull the line off.

 

Thanks to all who sent pm giving me advice on removal of the clips on the cooler lines.
Here's a pic of a clip that I have half way removed from the cooler line. I bought the tool in the picture from Harbor Freight that comes in a set of four with different tip configuration. I forgot what the tool set is called but cost less than $5. Hope this helps others .

 

Again, thanks guys