Thanks for all the responses. It does seem like my new fan clutch is fine, and it definitely makes a difference when it comes to keeping the engine cooler. Initially I wasn't used to hearing the fan spin when accelerating because I never heard that with the old worn-out clutch, but now I'm getting used to it.

dannym, I've heard that before about not laying the clutch on its side, but it doesn't make a lot of sense, especially when you consider that all the new clutches are shipped in mostly horizontal positions.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL