If anyone was wondering (as I was), replacing the rear coolant connector without removing the intake manifold isn't too hard of a project. Much better than taking off the intake. Remove the battery box, ignition assembly (coil and wires) valve cover and the panel(s) against the firewall - the ones that need to be removed to replace the HVAC filters. The top connector bolt is easily removed from the top with a 10mm gear wrench, but the bottom is tougher. I used a 10mm box end wrench and reached under the connector to access. Some arm contortion involved. Maybe a small 1/4" ratchet and socket would be easier? That might premiss getting at the lower bolt straight down, from the top.

Once the bolts are off you can flex the loose connector and hoses up to gain access to the hose clamps. That's it.

My connector was leaking in the cold. I reinstalled with a good thick bead of permatex ultra grey "outboard" of the o-ring. So far so good. 235,000 miles on the beast. Might be time to retire it in the next 12 months.