Hi, I need to fit a heater module so my aircon will work in cold weather. When my aircon guy tried to put a replacement in , the top plastic piece broke , of cours. It is 22 years old and runs like a dream my falcon , excellent . I bought a replacment part for the broken plastic. However i have been told a heater module can be installed a different way , can anybody give me ideas as to how it may be done, cheers