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Like you said the most likely reason for this is that the blower motor resistor needs to be replaced, it is located on the bottom of the heater box near the blower motor and held in by two screws, the electrical connector may have a lock built into it, you will need to slide the red tab back to unlock it if it has it and then squeeze the tab and pull the connector out of the resistor block
The blower motor resistor is mounted to the bottom side of the HVAC housing near the blower motor. It can be accessed for service from underneath the instrument panel.
I hope that this helps you
Thanks for the info!
Was so glad to know that I didn't have to tear apart the dash!
Hope I don't need you in the future but if I do, I'm glad you're there.
You are very welcome
If you need any thing else just let me know
2003 Jetta left rear window blue plastic part of the