I have anb Audi 90 Quattro, and have a busted-up radiator. Trouble is, I don't know which it is to either reorder it, or just take it out, if it's the A/C radiator. Anyone know which is which? Any help would be greatly appreciated. Also, anyone know if that plastic panel beneath the engine to hold stuff in or whatever, is important enough to be needed, or can I just take it off? Thanks!