I'm now starting to wonder if I have a faulty B13 temp. gauge sensor. My viscous fan operates as per testing procedure (thanks to myarmar for instruction) but engages at 85C not 95C (as IC gauge reading). My Aux fans engage at 110C (I assume all 119 engines are the same and thus should operate at 100C). The common link is what I'm using to measure temp, the IC gauge; now where did I put that thermocouple?

Has anyone got the transfer function (temp Vs resistance) for the B13 sensor - maybe it's the same as the B10/8? Currently (car has been still for a while) reads 1.02Ohms across the B13 and the IC gauge reads 65C, but my fingers dipped in the coolant say around 75C.

Jim - BTW my aux fans seem to be 'stageless' ie only on or off. You mention that the SClass they're three stage, do you expect all 119 engines to be the same?


Lea

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'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

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