The Dark Wob

Do I see this correctly, that heater is thermostatically controlled?

Yes. The mechanism locks fully on or fully off at the extremes of it's travel. Between the two it is controlled by a bellows thermostat which will hold the cabin at the temperature set.

Quite fancy.


Phil

Was that heater standard equipment on the Chieftains?

Climate control then?

At least that's the description they claimed on XJ40s even without AC.

Junkman wrote: ↑Tue Jun 18, 2019 12:10 pm Was that heater standard equipment on the Chieftains?

The heater pack was an option, however thermostatic temperature control was standard to the option.

Phil

They were just miles ahead of the rest of the world back then.

From what I can see, Cadillac and Pontiac got thermostatic valves as standard, the rest of the GM range it was an upgrade to the heater option.

Phil

I just stuck the valve in the freezer.

The valve opened up, set on partial-cool.

That still works. It also holds water if I put a little in the top pipe with it shut. I guess just under pressure it leaks.

Phil

Just gave a guy who repairs these valves a call; left a voicemail and hopefully he'll call back.

Phil

I used to repair the ones for the Imperials, which are similar. Same story, rebuilt ones were hellish expensive.
It's not difficult.
There was a company nearby that could CNC polyurethane seals on a lathe by cooling it to -200C.
If that tech was available 25 years ago, it must be available now.