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Old 10-05-2012, 04:44 AM   #67
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Join Date: Oct 2006
Posts: 33,172
Sounds like a bad idea. Decreasing cooling system pressure increases the chance of localized boiling and cavitation. Localized heating leads to detonation and warping. Cavitation leads to reduced cooling and increased coolant pump impeller wear.

That's a lot of pretty bad negatives just for a cheap fix for sporadic expansion tank failures.

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