I thought the same thing when the AS-Reamer light came on a few times during the coldest days of winter. All I had to do was wait a minute for the car to warm a bit and restart.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!