My 300TE runs consistently at 100C with A/C on even on the freeway when the temperature is 90F +

I could have sworn that it got worse after replacing my thermostat. I am just concerned over premature warping over the head as I only did my top end rebuild about 8k miles ago. I hardly want to revisit that anytime soon considering how meticulous I was over the whole process.

So my first question -- How many different variants of the thermostat's are there? How can I tell what mine is? Would it be written on it somewhere?

My fan clutch is working fine as I hear it spin up and slow down once I get to the freeway, but it spins high around the town all the time.
I've done the engine temp sensor for CIS, but not the one for the cluster (is this one also connected to the fan clutch? or does the CIS-one do that?)

Anybody know which variant the one on fastlane is?

Thanks,
Robert

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k