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post #1 of 4 Old 8th June 2006, 07:34 AM Thread Starter
imolaman
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TEMP SWITCH AND TEMP SENSOR

Ok a technical question for all the gurus out there...

When looking at the RealOEM.com diagrams for the S62 cooling system, both a temp switch (located in the actual thermostat housing) and a temperature sensor (located in one of the large hoses going in/out of the radiator) can be found.

Now, I assume the sensor actually measures the water temp, and this is evidently what we see in degrees celcius on the OBD when selecting Test 7. But, what is the purpose of the switch at the thermostat, and what does it "switch" on or off?

Part no's are as follows:

Switch : 136 217 03 993
Sensor : 136 214 33077

Regards,

Rudi

2001 Imola Red II E39 M5 - Stock
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post #2 of 4 Old 8th June 2006, 09:05 AM
Tozzy
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The sensor in the hose is for the electric cooling fan and the sensor in the thermostat housing is for DME.
I would think that the "switch" description is just a typo in the diagram since the sensor in the thermostat housing is a NTC resistor. If one of them is a switch it would be the fan control one.

/Thomas
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post #3 of 4 Old 10th June 2006, 03:11 PM Thread Starter
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Quote:
Originally Posted by Tozzy
The sensor in the hose is for the electric cooling fan and the sensor in the thermostat housing is for DME.
I would think that the "switch" description is just a typo in the diagram since the sensor in the thermostat housing is a NTC resistor. If one of them is a switch it would be the fan control one.

/Thomas
Thomas,

You are right. I did actually replace the sensor at the thermostat, and my problems with an erratic gauge is gone!

aaronmiles: The gauge is now sitting back in the middle where it used to sit. Perhaps try this, as I remember we were experiencing very similar problems with temperatures recently.

Cheers,
Rudi

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post #4 of 4 Old 10th June 2006, 11:38 PM
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