Golf black temp sensor - M10x1 fitting

[POLOMON]

Hi All,
I'm running a golf black temp sensor/golf thermostat housing/golf rad/polo fan switch on the rad and a blue temp sensor off something else.
Since getting the car back on the road the temp gauge goes HIGH asin sits at 100 and walms to 110 when driving abit quick and fan kicks in at 112.

Now, this isent right, i know.... But if the fan will kick in the same as before as its the same rad switch, its just the gauge reading wrong, surely.... so i need a different black temp sensor that HAS to be M10x1 fitting. the golf one i have i thought would do, yet doesent seem correct. its out of a mk1 golf.
Does anyone know the resistance specs of the stock polo black temp sensor or know of a good m10x1 replacement black temp sensor with the above fitting specs?

Cheers :-)

Here is a pic of the thermostat to show what it looks like, blue temp sensor on the side, black on top. :-)



I have posted the above on ClubPolo but i know many dont go on that site so to improve my chances of getting it sorted i thought i'd copy it to here also.

[ereeiz]

I should think your local motor factors would be able to help out with the millions of reference manuals, they normally list specs of parts. Failing that try the part no stamped on the sender and "spec" on google.

[POLOMON]

They arent much help ereeiz. Ive asked for the resistance values of a stock sensor and they had no idea. If i had that i would ebay/google it.
There are no part numbers either.

[Andy]

Measure the resistance of a stock black sensor and find out?

Incidentally, the tolerance on the black sensors seems to be epically wide from the factory. Yoof fitted a new one to his as he was concerned about the gauge saying it was running at 70°C all the time, and now it reckons on 105°C all the time.

[Andy]

Attached is the blue temp sender curve, showing tolerances on that.

[POLOMON]

I cant measure tollerance on the stock one though Andy as i have no way of fitting it :-( Could i put it in hot water and wire it straight to a spare set of clocks to see what it reads? Not sure what i could do to be honest.
For ease i thought i'd ask, see if anyone knew

It shoots up to 100 anyway and then levels out happily, no way is it doing that due to over heating. so im going to just order a new temp sensor i think, im not sure how to work out resistance of the black temp for the gauges.

Thanks for the help 

[hayesey]

get a pyrex jug, a black sensor, a multimeter set to resistance mode, a kettle and a thermometer.

connect the multimeter to the sensor connectors so you are reading it's resistance.  Then boil some water in the kettle.  hang the sensor into the pyrex dish so that you can pour boiling water in, submerging the bottom metal part of the sensor but not the connector and wires!  Pour in boiling water and put the thermometer in at the same time.

Then just wait and keep writing down the resistance values at various points on the thermometer until the water is down to room temp.

That should give you enough of an idea, if doesn't have to be accurate really, as Andy says the tolerances on these sensors are huge.

[POLOMON]

Thanks very much Hayesey, I'll give that a go tonight, thanks!