Thanks everyone for all the suggestions! Especially that low coolant lamp, that sounds like worth doing.
Yes I am in the U.S. but the car is actually in... Sweden...! So it is a left-hand drive euro-spec car.
So the reason I was thinking of getting the valve for the old GM land yachts instead of something that's a more direct fit is specifically that the GM valve is all metal rather than all plastic or mixed. I was thinking the all-metal valve is unlikely to come apart suddenly and catastrophically the way I am apparently not the only person to have suffered. Mine came right apart in the plastic section, which would have led to another top-end job if it happened on its own (and it was close to going, it was leaking from a crack in the plastic already).
Of course a low coolant lamp is an even better idea, the heater valve is not the only thing that can fail (in my case it was one of the three heater hoses...)
Great forum!! Thank you!
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