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Hello I'm Neal and I am here to help resolve your issue. If I cannot help I will opt out and refer your question to another expert.
That is a known common problem on thse and is most likely going to be the blower motor resistor pack. It is a big job and the dealer gets about $1500 to fix it.
Sorry to hear you are having problems and I hate to be the one to give you the bad news.
2003 Jetta left rear window blue plastic part of the