When I said "free-wheeling" I meant that the fan is still rotating and drawing air through the radiator. Of course if it's not even doing that then it's useless.

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2004 VW Jetta TDI (manual)

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

Thanks for this important Threadid.

I fell that the fans clutchs on my 190 E, 2.6L, 1988 and 300E 1988 did´nt work OK.

I dont see changes in the fan clutch revolution where engine

temperature is over100ēC.

The outside temperature in VEnezuela, is always over 30ēC., the

auxiliary fan change to a high velocity in traffic when temperature

is over 100ēC. But we don´t fell any change in the fan clutch.

Please how to check the fan clutch?

How to service them?

How to add viscous oil TOYOTA 6000 cps.?


Thanks.

MaRIO fARIAS
laprefar@cantv.net

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MB LOVER

Mario,
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Run the engine at 4000-4500 rpm's... When a coolant temp of 90 to 95 C is attained, the fan speed should increase by approx. 1000 rpm, which can be clearly noticed accoustically . ( You can hear the change in speed of the fan )

A defective coupling cannot be repaired with workshop equipment, and a new coupling should be installed.

Temperature controlled Viscofan couplings should be transported and stored vertically. For short periods , eg, during assemble--the coupling may rest on a flange, but never on the front end.

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that is almost verbatim from the manual... with clean up for English speakers.... LOL