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The temperature switch is normally closed and opens if it gets too hot, stopping the engine. If the engine runs after the master switch is released from the start position, the wiring is intact.
Ha, I just noticed the typo in the quote from the manual I posted above. 60°C is 140°F, not 14°F. I assume they mean the temperature of the air coming out of the shutters.
From TM5-6115-585-12, page 3-10:
When loaded to about 1/2 capacity, my 003A's shutters open fairly far in the summer, but usually not all the way. It takes long enough for them to start to open that I got a little nervous the first time I watched them.