Originally Posted by GregMN

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The overflow bottle had about 4" of coolant in it. (it started empty)
The system was pressurized enough to be pushing air and/or coolant into the overflow bottle (very little, very slow gurgling) for about 5 to 10 minutes after I turned off the motor.
The reservoir was still full up to the "max" level.
There were some very slight gurgling sounds that seemed to be coming from the intake side of the head...