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Old 10-03-2012, 10:31 PM   #9
Zero. Leaks.
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Join Date: May 2008
Location: NYC
Posts: 30,384
My Ride: '02 330i 6MT
So basically when the system is fully hot up to temp, when we loosen our caps that is why a lot of steam/hot air comes out. Wouldn't using this cap to lower the pressure force the water pump to work harder to move coolant around as it's not pressurized as it should be?
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