I don't object your assumption. I too thought it was the 100C mark, but thinking it is 90C just makes me feel a little better.

However, the watertemp stays just below it, maybe half way or 3/4 up from the 80C mark. At a current outside temp of 100F -105F.

Out in the desert it will be 110F -120F maybe even higher, usually the gauge shows slightly below the dubious mark of 90/100C.

I think I will be ok, I was just wondering why the 300D indicates a straight 80C. Could be the gauge, but than, yesterday the aux fan came on, which is about correct once the temp starts hitting 100C ...

...So, I suppose it is the 100C mark and as long as I stay below while cruising, I should be fine ...

I could take the thermo out, going through the desert, how's that? But I thnk it won't seal, because without the thermo, there is no pressure level for the rubber gasket.

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