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ConnClark · 10-03-2013, 02:43 AM

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.

10-03-2013, 02:43 AM	#8 (permalink)
ConnClark DieselMiser Join Date: Jun 2008 Location: Richland,WA Posts: 985 Das Schlepper Frog - '85 Mercedes Benz 300SD 90 day: 23.23 mpg (US) Gentoo320 - '04 Mercedes C320 4Matic 90 day: 22.44 mpg (US) Thanks: 46 Thanked 232 Times in 160 Posts	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. __________________