Thermal Switch Question

["Dombey, John R" <John.Dombey@domain.elided>]

All,

My Stag has what appears to be a thermal switch mounted in the left side
radiator tank, which I have always assumed was to control the electric
fans on the A/C installation (most of which is missing from my car...)
I thought it would be handy to use it to control the electric fan I've
installed, but it is apparently non-functional (I heated it well above
250 degrees F and it didn't switch).  It has two contacts on it, and I
have not seen such a thing on any of the other Stags around here which
have A/C.  Does anyone have any info on this switch, like a part number
or cross reference?  Does anyone else have such a thing on their car?
It's got fairly large, coarse threads, (like 15/16ths diameter, or maybe
more - I wrote it down and don't have it with me), is located about
half-way down the tank, and doesn't look like anything I've seen on my
other cars.  I looked in the Stag Parts manual, and couldn't find
anything like it.  Can anyone help?

Many thanks,

John
'73 Stag, '69 TR6, '81 TR8, '86 XJ6
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Sona si Latine loqueris.

John Dombey
john.r.dombey@domain.elided
253-773-0827