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Old 10-03-2013, 01:43 AM   #8 (permalink)
ConnClark's Avatar
Join Date: Jun 2008
Location: Richland,WA
Posts: 966

Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

Gentoo320 - '04 Mercedes C320 4Matic
90 day: 22.44 mpg (US)
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The coolant doesn't normally flow until through the heater core until the heater is selected. If you notice a significant drop in temps with the heater on your radiator block is too much and will lead to excessive engine wear.
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