[Lynn]

Appreciate your response, and I am sure if I bought all new GM parts, I could make this work. Wanted to eliminate the plastic.

I wasn’t comfortable cutting off the tubes at the heater core.

Turns out I was also NOT OK with using the metal adapters I got from Amazon. There is NO WAY to release them once you install them absent some kind of special tool that would need to go behind them. Can you imagine being on the road and one of the plastic “T” fittings breaks loose? No thanks.

After pulling the plastic adapters that go to the “T” fittings (also plastic) I decided to pull off all the plastic pieces.

I ended up purchasing two brass “T” fittings 3/4 x 3/4 x 1/2.
That meant I had to cut the factory ½ inch heater hoses for the rear heater. Used a mini tubing cutter. Bought a foot of ½ inch heater hose. Bought a couple of 3/4 couplings.

It was not easy sliding the 3/4 heater hose onto the heater core fittings because of the big lip that the factory “T” fittings attach to. But, after heating the ends of the hoses, and using a little lube, I was able to get them on. Used traditional worm gear style clamps.

BTW, the two T fittings just disintegrated when I removed them, so they were about to go anyway. I am certain the brass will outlast the plastic.

Peace of mind.

Tried to post pics. Getting a message that says that function is not currently working.
Will try again tomorrow evening.