What would cause this seal to blow out? It has run fine for several weeks. I know it was seat properly. I looked at it while installing several tank coolant sensors. After installing new OEM dealer seals, it's worse now. It doesn't leak while idling. It does leak when moving. Vibration is causing leaks. The replaced plate may not fit properly. I'll check the lock clip. I wonder if one side is not seated properly.

The tank was replaced too. Unfortunately, the other new tank didn't fix the "check coolant level" warning. I'll check the plug for power. I'll even try a temporary bypass.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)