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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Temperature gauge not moving
At the weekend and last night the temperature gauge moving OK and hot air.
This morning after the drive to work (6 miles or so) normally the gauge is not quite to normal position but not far off but this time it was still in the cold section just above the blue.

Got into the car park, header tank warm and top hose warmish and some warm air but not as warm as normal.
I am going to let the coolant/engine cool down and check the header tank to see what the coolant level is.


Thermostat & coolant changed about 4 / 5 weeks ago and fine since then, 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #654495 3rd Oct 2017 7:15am
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bankz5152



Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2166

2004 Defender 110 Td5 DCPU Epsom Green
Is it plugged in? Mine came loose, just needed reconnecting and a clean then it was fine.

Got any diagnostic kit?
Post #654531 3rd Oct 2017 10:08am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I have diagnostic kit but not with me in work. Will check the coolant level and then when home plug in and see what gives.

It was working last night so I assume its still plugged in. Does this run via fuse? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #654533 3rd Oct 2017 10:11am
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bankz5152



Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2166

2004 Defender 110 Td5 DCPU Epsom Green
Not sure if it runs via a fuse, though I expect it does but the fuse runs the entire cluster.

Like I said mine was fine one day, not the next, it had worked its way loose due to a corroded connector. Worth checking the simple things first!

Diag kit should tell you if its running up to temp properly, maybe ven tell you the gauge is faulty (never tried myself)
Post #654536 3rd Oct 2017 10:17am
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Temperature gauge on TD5 engine driven by ECU one fuse serve all 3 gauge fuse 3 10 amp passenger compartment
check wiring at gauges


Click image to enlarge



Click image to enlarge



Click image to enlarge


Last edited by dorsetsmith on 3rd Oct 2017 10:58am. Edited 3 times in total
Post #654539 3rd Oct 2017 10:30am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Thanks Bankz. I will check the wiring later.

Thanks DS.

I think with Nanocom I can test the gauges.... 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #654543 3rd Oct 2017 10:52am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Just check coolant level and about 10mm below cold fill line.
I don't think any has been lost, I think that is were the coolant has levelled out at after changing it and running around for a bit. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #654559 3rd Oct 2017 11:35am
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gazman



Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652

United Kingdom 2003 Defender 90 Td5 HT Alpine White
mine always drops to 10mm below, it doesn't matter how many times I top it up it always drops to that and stays there. 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r
Post #654580 3rd Oct 2017 1:06pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
The gauge does move but appears to take more driving than normal.
Nanocom has a feature to make the needle for the temp gauge move - and it does, so that tells me the gauge and wiring is OK at least to a point.

Took car for spin and Nanocom showed the temp to be 69.3C this was about the highest I saw it while on a test run. A blast down the motorway and the needle did eventually move.

The pic below shows the needle sitting at 69.3c as read from Nanocom.

Click image to enlarge


I think I will replace the temp sensor in the cylinder head. From memory its the same sensor as on the Fuel pressure regulator but will check this first. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #654672 3rd Oct 2017 7:25pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

has same part number Thumbs Up ERR2081
Post #654676 3rd Oct 2017 7:29pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Thought it did. I have two of them in the shed Smile

Simple item to swap. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #654677 3rd Oct 2017 7:31pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Replaced the temp sensor with a spare and topped up what coolant I lost while swapping the sensor out.
Will plug in the Nanocom tomorrow and see how the temperature reading is compared to the needle. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #655162 5th Oct 2017 6:02pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
25 minute trip to work at roughly 30mph and still the same.

I think time to replace the thermostat with the original one I took off and replaced when doing to coolant 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #655265 6th Oct 2017 7:38am
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

have look at this before removing parts cooling system


Click image to enlarge
Post #655278 6th Oct 2017 8:44am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Thanks DS. Are you referring more to the last paragraph? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #655282 6th Oct 2017 8:57am
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