A friend of mine just rang me to request any helpful advise in removing the heater core from a 98 Seville. As I am unsure what any Cadillac beyond 1961 looks like (that's a joke; haha) I suggested I'd ask the question here. Any body able to help . Apparently he's gone in from the dash and from the firewall and is still not able to get it out. Help repayed in love and kindness. Q