So i've got my gf'* 99 bonne needin the heater core replaced. the lines are already on an elbow. i have the inside pulled apart. i have the cover off, but i can not get the cover out. i have taken the glove box out as well as the top vent shroud. there is the main duct work still in place (that i can't see how it would be removed) and that appears to be whats preventing me from removing the cover. can i get some help from you pro'* on how to get this cover off/out? thanks for all your help in advance!