OK, here’s a pic from my iPad so you may have to zoom in. (This is no longer a major priority as I finally found a set of pliers that could pull off the spring clamp on the lower pax side hose.) I would like to get a proper peacock put in as it was a mess draining by just pulling the hose off.
Turns out the heater core was clogged. After initial draining, I drove around for a couple of days with two bottles of Prestone coolant system flush w/clear water in the system. Then undid both the front and rear heater hoses at the firewall and blew them out in the opposite of normal water flow direction; refilled with clean water, drove more and then final drain. I used a water hose and compressed air to blow everything out before final
filling with fresh antifreeze and H2O. Presto, HEAT!