I know the suject is very old, but I thought my findings might be of interest.
My armature thermistor was open circuit so I've removed the heat shrink from it and found that the glass thermistor was smashed, and there was also a 180 ohm resistor in series with it.
Because the glass bulb from my thermistor had been ripped off I decided to see if I could repair it. Although the bulb was missing the connection legs were still present, I stripped the heat shrink sleeving off and low and behold NO resistor.
I removed the good thermistor from my other C5 and checked, by feeling, the first 10 cm from the thermistor and can't detect any addition connection to the thermistor, so I assume the there is also no resistor present. When I find my small diameter heat shrink sleeving I'll check out the second unit to ensure there's no resistor present.
The good unit reads 10K at 25°.
So I'm wondering why the 180Ω resistor was fitted. Has anyone else info on this subject?