Multi-function Temp Sensor...

Bernie Benz b.benz at
Tue Feb 15 17:45:41 EST 2005

No, IMO leakage is not related to the failure, inasmuch as the connector
side of the sensor is also sealed and the coolant wouldn't run up hill
anyway.  Further IMO coolent in the mating harness side connector or its
boot will not cause connection failure if the contacts in the concector have
the proper contact pressure.  I don't use Si caulk in this app, but if you
have a corroded surface on the water manifold gasket seating area, it would
seal a leak there.  Once you find a good sensor they last a long time, IME.
I've had better lick with the passive 3 terminal than with the active 4
terminal type.


> From: "Derek Pulvino" <dbpulvino at>
> Is that then the failure mode of these sensors?  Leakage around the threads
> seeping into the electronics on the nether end of the sensor?  If so, I
> imagine this is how you install said sensors on your vehicles (with Si
> caulk) and that you also see a longer than 18-month average life span?
> I do know that the sensor as currently in place on my vehicle has been
> properly installed up to the gootentight spec.
> Derek P
>> Derek,  The wetted end of the sensor is solid brass, thus it can not leak
>> into the internals.  If leaking it is the threaded connection, so screw it
>> in with Si caulk.
>> Bernie
>>> From: "Derek Pulvino" <dbpulvino at>
>>> Phil,
>>> Haven't topped it off, but could you imagine it?  Being able to solve
>> one of
>>> the issues on this car so simply?  My word!  I'll have to add some when
>> I
>>> get home.  And no, boots still in place, so it may be corrosion, but on
>> the
>>> last changing I did try to clean the connect up best I could and let it
>> dry.
>>> Unfortunately though, it really does look like the sensor is leaking
>> unless
>>> the residue on the boot is from previous lifes with other mfts'
>>> Derek P

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