hmmm i had this problem this fix didnt work, its becoming a major issue in winter, this was my conclusion.
Water or dampness was getting into my car maybe just dampness for you might not even see it and the wires for pas, heaters, rear demister were shorting out !
So take carpet away from passanger side footwell your see some wires bolted onto side of car un-bolt wipe spray some WD40 to help disperese water then screw back, also check fuse and relay plug, this worked for me everything works again !
Its worth a go 2min job....
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