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Hi Im David, thanks for using the site, here is what you need to do:
interrogate the climate control panel;ignition off/fan switch off/temperature to coldest/air to face ventsignition on/depress and hold air recirculation button and at same time - within 10 secs - depress rear window&mirror demister button 5 timesrecirc button then should blink twice & self diagnosis beginrelease buttons and watch carefully recirc button indicator which will blink between 1&15 times if a fault code has been loggedrecord then switch ignition off to cancel self diagnosis.
checking in to see how its going