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On some engines a heater in the bottom radiator hose will circulate heated water though the block and heater core (those with the thermostat in the upper radiator hose). On all the MB engines I've seen, the thermostat design and placement of the lower radiator hose (high on the water pump, or above it, with the thermostat on the suction side, not the pressure side) will prevent much ciruclation. No percentage in heating the radiator in the winter, after all.
Probably a better "cheap" heater would be a dipstick heater -- this would heat the oil, and by convetion and rising air, the block (some). Hot oil is much less viscous that cold oil, so the engine will crank a lot faster.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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