i'm feeling stupid about removing the heater core from my '96 f250. have read most of the posts saying this is an easy job, i also have read the shop manual which agrees in general with what has been said in the posts here. but here's my problem: i have the glove box out. i also have a black box piece of electronics removed. i have the 7 or so bolts on the plastic heater core box cover removed and the cover is free. but the cover is blocked from sliding up or down or towards the rear of the cab (out of the glove box openiing) by a bar that is part of the dash just under the glove box. the bar does not appear to come out separate from the entire dash assembly. what am i missing?