Richie:
I recall you saying that you had pulled the head recently and hadn't timed it correctly? One question... did you re-use the head gasket?
~Paul
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'91 300E, 212K miles
For future reference, to ensure no air gets trapped in your coolant system when refilling, remove the bleed screw shown in pic until water begins to overflow. Replace screw (14mm), then finish filling expansion tank to halfway mark.