Report "Ac evaporator box removal 2002 accord drain stopped up cleaned with air, several times, this time I am taking the housing off the evaporator for proper cleaning. I have removed all screws but won't come off. seems to be hung up at firewall. Theres a heavy "leg" of it that fits to the fire wall. all screws have been removed. Is there a special bump, torc, or a stud that has a cap nut on the engine side of firewall....thanks"