I went to the Men's Mall over the weekend, picked up the small elect circulation motor that burned out last year. I also picked up two Duo valves, an interesting piece of gear. There is a small cone shaped plunger that modifies that amount of hot water going to the heater. One valve had the cone as a cone, the other valve had the cone attached to a shaft that fits inside the plunger. Looking closer at the first one the shaft had broken off inside the plunger (just like the one I reinstalled in my car). Seems the plastic shaft has to be intact in order to cut the hot water supply to the heater.

I plan on soldering a brass shaft on my valve as well as the other one that broke. Hopefully that will bring the A/C back and I'll have two spares ready to go.

__________________
1960 190D (college car), gone
1995 E300D, 325 k
2019 LEXUS UX 250h (spouse mobile)
2003 Nissan Frontier Crew Cab, 125K
2007 Jeep Grand Cherokee Overland 3.0L MB diesel, 200K
1978 GMC Classic Motor Home