Hey, ill start by saying this is about my 4.6l 1999 expedition. Since I'm not a member of any of those forums, figured id try and ask here. Hope its still an appropriate thread. Anyways, I recently did a coolant flush and fill (myself) and after doing so my air conditioning started working flawlesssly. This is a great thing indeed, prior to this it only blew HOT air. I just wanted to know what effect it was exactly that the coolant had on the air conditioning and why a flush and fill actually fixed it. Thanks a lot!