Interesting question. I've been wondering about the aux water pump. Sometimes at idle I have good heat, sometimes not. So I'm suspecting it's on its way out.

What would be the connection between my temp calibration issue and the aux water pump?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife