1990 Volkswagen Jetta Q&A

1990 Volkswagen Jetta Question: my heater blower will not work On high speed #4 but will work on speed 1,2,3,

it has power to the blower fan I check it . I jump the blower fan from the battery with a wire it work in all 4 speeds . But will not not with every thing all hook up like it come from factory . It was working than stop . Can you tell me what is the problem -
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