On our '06 I learned that I needed to check the sight glass with the engine running, but not up to operating temperature. If I filled it up to the middle of the sight glass window when shut off and cold, it would overflow for a while, a few drops at a time when running. But if it was running and cool, and in the middle of the sight glass window, it would fill the window when hot, but not overflow.
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2019 Winnebago 22M
2015 Jeep JK Rubicon
Former Owner, 2006 Alpine Coach 36MDDS
Former Owner, 2005 Tioga 31M and Arctic Fox 22GQ
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