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Hi Gemma Welcome to the Forum First place to look is in the iDrive settings in case someone has set something there Max/Min. I take it all fuses have been checked? If the temp was adjustable but now isnt you may need a Diagnostic scan to determine just what the issue is. There are a couple of Companies who repair these if it is the climate control ECU Testing and Cartronix Google will help you find them talk to them to see if they can help Hope this helps Dave