Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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Have you checked the coolant level by looking under the hood? There is a lever on the left-side kick panel in the driver's side knee well. Pull that and the hood will unlatch. Then raise the hood slightly by lifting the bottom of the grill. A small plastic 't' will protrude from the top of the grill opening. Pull that and lift the hood. Look to your left at the front of the engine. There should be a large white plastic container. It holds the coolant overflow. There is a raised horizontal line toward the top that is "full hot." There is another line lower down that is "full cold." Depending on whether the engine is warm or not, there should be liquid above the bottom line and at or just below the top line. If the liquid is below the "full cold" line when the engine is cold, you should add MB approved coolant to that line or slightly above it.
The 'check coolant' light should go off after this.
Hope this helps.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck