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scott3933

Member

• Mar 20, 2025

• #21

It might be worth checking the grounding of the gauge and the wiring? I had a very similar issue with my new to me 110, the needle on the gauge would go right up into the red looking like it was overheating, but actually the issue seemed to be the lack of earth to the gauge. Not sure how it would've been originally but definitely seemed to sort out my issue adding in a new earth wire to the bulkhead.

The sensors are basically thermistors, and the gauge reads the resistance compared to ground (no resistance). So if its reading higher than you expect there could be more resistance somewhere in the system, potentially due to a bad connection or something like that.

 

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Nickincabin

Member

• Tuesday at 08:13

• #22

And a brand new black sensor....this is where it went!

 

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kermit_rr

Very

Full Member

• Tuesday at 08:31

• #23

and whats the actual temperature? if the dial doesnt match the sensor then it will give a false reading

 

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Nickincabin

Member

• Tuesday at 08:48

• #24

Changed the sensor .....black for defenders green for discoverys! Engine cold

 

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Anaconda

Well-Known Member

• Tuesday at 10:12

• #25

Why don't you buy aftermarket gauge with sensor and put it in the top hose?
Or capillary gauge if you know what the thread in the housing is.
Saves buying endless sensors which are not compatible.
Have you tried earth on the gauge which someone previously suggested?
By the way even if you do find a sensor which seems to work you still need to check temperature independently to make sure it is correct.
We have fitted two gauges on the 200tdi.

 

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Nickincabin

Member

• Tuesday at 18:05

• #26

Thanks. The gauge is a pukka LR one from Brookfields. My chum is taking the front end off on monday to check the wiring an fitting an earthing wire. Meanwhile I will drive around without looking at the Temp gauge.... Have checked the top hose and it is not overheating.......fingers crossed!

 

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scott3933

Member

• Today at 11:12

• #27

Nickincabin said:

And a brand new black sensor....this is where it went!

Click to expand...

That is exactly what my temp gauge looked like with the earth issue! Very quickly up into the red, when in reality the engine wasn't even up to temp at that point as someone had removed the thermostat I knew right from the start mine wasn't actually overheating as I checked with an infrared thermometer.

If you have the capability I would take the gauge out and test it externally, eg supply it with 12V and connect to one of the sensors you have that is supposed to be the right temp range for the engine and see what it reads in known temperature water, say 80-90c