I have a 1997 blazer 4dr 4x4. Bad heater core. I pulled the dash and got everything marked and disconnected except the Vaccum lines. I can't seem to figure out how to disconnect the lines. I can't see where the black Vaccum tube that goes into the firewall disconnects from and exactly how to disconnect the white connector with all the other lines going to it. Please help.

Thanks
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I got the cluster of vaccum lines disconnected finally, I just can't figure out how disconnect the black vaccum line that runs thru the fire wall.