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Old 10-25-2013, 09:38 AM   #120
LeMansteve
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Join Date: Nov 2008
Location: USA - GA
Posts: 1,626
My Ride: '04 330i 6mt ZSP ZPP
Quote:
Originally Posted by blantonator View Post
I'm at 130K miles(2004 ZHP) with original cooling system. Seems like something I should do soon. Is there any reason it would be less likely to go in the winter vs summer?
A major contributor to cooling system failures is heat cycling of the "plastic"/composite components, such as the expansion tank. One might argue that the components are more likely to fail in the winter because the heat cycling occurs over a larger range of temperatures and the bottom of the range can be relatively cold.

For example, in the summer your cooling system components might reach a low of 70F once the car has cooled overnight, then heat to operating temperature of ~200F. During a Virginia winter I would imagine the lows could dip into the teens overnight. You are asking the components to get really cold then reach operating temperature within a couple of minutes. I imagine this is a much more stressful condition for your cooling system.
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