I have recently acquired a 1988 LHD Corniche imported to UK in 2017 from California. VIN SCAZD02A3JCX24256. When the hood is closed the heating works well. When I open the hood is open there is only aircon air no heat. There is an audible click when teh hood settles in the open condition. I would like to have heat when the hood is open. If I disable the switch will this work and where is the switch? Is this normal behaviour? Thanks for any help.