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M.teague



Member Since: 28 Aug 2025
Location: Kernow
Posts: 2

United Kingdom 2002 Defender 110 Td5 HT Auto Coniston Green
Temp sensor
I have a 2002 td5 defender,
I am hoping that its possible to install a regular temp sensor and gauge as i like knowing exactly whats going on temp wise, perhaps a sensor into a coolant pipe as the add on sensor for electronic fan upgrades used on series's were, i will be keeping the old gauge and sensor in situ as i am wary of the ecu, at the moment the guage goes straight up to half way and then after a minute or two drops back 1/4 and then down to zero where it started from,
Has anybody done this previously or could point me to any info that may help,
Thanks,
Post #1074311 29th Aug 2025 11:55am
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Hazza



Member Since: 10 Jan 2011
Location: North Yorkshire / Leeds
Posts: 236

United Kingdom 1990 Defender 110 Td5 HT Bronze Green
It's possible to drill and tap a hole into the same housing as the standard sensor. I have a Durite guage with it's sensor located here.

It does sound like you're getting strange readings on the standard gauge 1990 Defender 110 200TDI Camper - now converted to Td5 power
Post #1074316 29th Aug 2025 2:11pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5991

2006 Defender 110 Td5 USW Zermatt Silver
As you know the gauge is not really that accurate but I believe the sender is, and you can use a nanocom or similar to see these reading in degrees C whilst driving.
Post #1074319 29th Aug 2025 2:34pm
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1316

France 2002 Defender 110 Td5 DCPU Chawton White
The gauge designed to appease our human mind. It stays dead center over a large (acceptable) temperature range and then goes full hot when too hot.

When I got my Td5 there was an earth issue somewhere and every time the AC compressor kicked in it would increase the temp gauge to where it would read almost in the red to then revert back to dead center with the compressor off. Although it was clear there was an electrical fault and a logical correlation it was still unnerving to see the temp gauge read high.

Nanocom will read you the real temperature and you can see it fluctuate. I believe there are gizmo's you can get that read the OBD2 code and display the figure
Post #1074321 29th Aug 2025 3:15pm
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bankz5152



Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2228

 2004 Defender 110 Td5 DCPU Epsom Green
I have a GORE block, replaces the stock one and gives another hole for an additional sensor. However they are no longer made. I believe you can get some sandwich plates that give you a 1/8npt hole for an additional sensor.

Or its the old school method of cut the top hose and fit one in there with the help of a universal adapter.

You need to keep the original sensor to keep the ECU happy or it will constantly think its overheating.
Post #1074323 29th Aug 2025 3:51pm
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M.teague



Member Since: 28 Aug 2025
Location: Kernow
Posts: 2

United Kingdom 2002 Defender 110 Td5 HT Auto Coniston Green
Thanks for all the replies and advice, its appreciated
I have a 2.5na in my 2a109 which i am o.kish with but the td5 is a whole new learning curve so i expect to be seeking a fair bit of hands on info,
Atb
Post #1074370 30th Aug 2025 2:51pm
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MadTom



Member Since: 10 Sep 2013
Location: Olomouc
Posts: 682

Czech Republic 1999 Defender 130 Td5 HCPU Baltic Blue
You can also remap the engine ECU, so it will work like standatrd thermomerer, not like an "indicator for human". Bigger problem is, when you loose cooling fluid from engine, sensor is not submerged in coolant and cannot measure any valid value. So for me more important is some coolant level indicator, than accurate thermometer. "Drobek" = The Small One - Discovery 2, "BlufĂ­nek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo Smile
Post #1074396 30th Aug 2025 8:18pm
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