Help I'm at my wits end need to replace the heater core.Got the kick plate off, the other parts that easily come off, removed all the screws behind the glove box but the lower casing will not fall off some one suggested I missing screw from the under side but I seriously can't find any even with a mirror and a flashlight I can see the darn thing through the vent, I' ve exposed on the lower casing box. My hanes manual doesn't have a thing on it I would be for ever greatful if someone could point me in the right direction.