Got car back on road today despite being under the weather with a bad cold. I am sure lying on my back on cold garage floor didn't help!
Installing the new cooler nozzle nut and washer was easy enough.
After cleaning up the other side and making sure I could get the atf union nut loose, I decided against messing with it. If that aluminum nut breaks, I now have a spare!
While car was raised, I changed the transmission filter and ATF. I had not done this before. Easy enough job, but for someone in mid-70s with car on jack stands, not much fun. Not much labour, so next time I will get garage to do it! Mind you, I bought a 1/4" drive in-lb torque wrench - may have to find another use for it!
Filled with coolant and ATF (in steps) then went for drive. Everything seemed good. Parked car and noticed red drip from rad area

Surely not my repair to rad leaking ATF?? OhOh other side! - I had loosened other side cooler union just to be sure I could - but had not re-tightened it!
Anyway, I think I am now done with 300D for the moment. Time to move on to other things.