The winters here and my heaters not? When switching heater on from controls I hear a little rumbling but no heat. Any clues as to what might be happening

The heater blower electrical circuit runs through a 30A strip fuse in a separate fuse box located on the left front inner fender. Flip open box lid, remove the strip and inspect closely, as cracks are difficult to spot. Better yet, just replace the strip fuse with a new one (about 50 cents). It could also be the blower regulator or blower motor (the rumbling you hear may suggest a failure here), but the fuse is the place to look first.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't