At this point, you have to open the thermostat housing and determine if you even have a thermostat. If you do, I wouldn't even bother to test it. The symptoms, including a low gauge reading and no heat, indicate that you need to change it.
These engines run 83-90 C. on the highway, even if it is 0 F.
They will drop down to below 80 C. at idle if it is really cold (below 20 F. or so).
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