No block heater? Mine was in single digit temps for just 6 hours and refused to start, still setting in the parking lot 30 miles from here.... Maybe this thread could be of some assitance of things you could try.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k