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Get one of those Infra-red thermometers -- the kind that you point at an object and it gives a reading.
Take it to see the car, drive around until it shows overheating and then point your IR thermometer at the thermostat's housing (a nice, big, heat-conductive target) and you'll know for sure.
I got a beautiful '93 240 for a song because the owner couldn't solve the overheating problem -- which was a non-problem because of the TCB, revealed to me with one of these IR thermometers. :-).
Good luck.
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