Mach4, your posts go back and forth between deg F and deg C. My point: did your test in post #8 really measure from 0 deg F to 80 deg F? That doesn't seem like much of a test to me, but perhaps you were using a "less than set-point" temperature to avoid damaging the t-stat?

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC