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Old 10-05-2012, 06:29 PM   #10
Matheeuwissen
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Join Date: Sep 2012
Location: Holland
Posts: 30
My Ride: BMW 323CI
I don't think your cap is not tight closed enough.

Maybe you can put some little pressure on the cooling system, probabely around 1 bar.
You can easily see it when the expansion tank is leaking, because the water will tear out of it.
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