Yep, the iron head OMs with the 2 stage thermostat cranked out heat before the thermo allowed any flow into the radiator.  A "normal" one stage thermostat car will get heat in about 5 miles.  The Iron head OMs with 2 stage thermo would be heating in about 2 miles.

Allan Streib via Mercedes wrote on 8/23/19 9:02 AM:
Never had a complaint about my OM617 heat. In fact they have heat faster
than any other car I've owned, as long as you follow the advice to
"drive off as soon as it's running smoothly"

If you try to let it "warm up" idling in the driveway while you make
your morning coffee it takes a lot longer.

Allan




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