do i need to be concerned with this port when i'm bleeding my whole system.how do i go about it?if not what purpose does it serve?thanks again,doc!

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)