I guess my fan clutch is defective too because I never hear the main radiator fan go into the high speed mode. Or is it supposed to do that only at really high temperatures? When climbing steep grades or sitting in stop-n-go traffic in the summer my temp regularly goes up to 100C and only the aux. fans kick on.

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2004 VW Jetta TDI (manual)

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