Sounds like a slipping belt to me. If your not sure when they were replaced last it's probably time to change them anyway. Only a few basic tools are needed to change all the belts. To check the tension push on the longest length of belt and it should deflect about a 1/2"
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Andrew '04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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