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QuintinC



Member Since: 06 Apr 2019
Location: Knysna
Posts: 32
South Africa 2003 Defender 90 Td5 SW Alpine White
1989 110 Standard Temperature Gauge Under Reading
This is the original gauge. The sensor may be new. 19J Turbo Diesel Motor.

When using the car reasonably hard, the temperature gauge barely comes off the stop onto the left side of the white arc on the gauge.

Any ideas before I break out the IR temperature sensor?

I would expect the gauge to sit somewhere around mid-range on a warm day.

What have other 19J or 200/300Tdi owners found? 2003 Defender 90 TD5 SW
1989 Land Rover 110 19J Turbo Diesel PU
Post #1064796 5th Apr 2025 10:28pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3536
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
Temperature sensor / gauge on a 200tdi is different from the 19J and using the wrong sensor causes the issue that you mention.

But also check that your thermostat is not stuck open. If replacing thermostat, temperature should be 82dC. That should bring your temperature gauge just under the middle. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #1064806 6th Apr 2025 6:26am
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QuintinC



Member Since: 06 Apr 2019
Location: Knysna
Posts: 32
South Africa 2003 Defender 90 Td5 SW Alpine White
I'm sure it is the wrong sensor - now, where to find the correct one.... 2003 Defender 90 TD5 SW
1989 Land Rover 110 19J Turbo Diesel PU
Post #1064807 6th Apr 2025 6:28am
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8221
 2011 Defender 110 Puma 2.4 USW Stornoway Grey
As above it should sit around the middle.

There are various posts about 19j to 200tdi conversions where sensors used are detailed, you should be able to find something helpful searching those. Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1064814 6th Apr 2025 8:33am
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QuintinC



Member Since: 06 Apr 2019
Location: Knysna
Posts: 32
South Africa 2003 Defender 90 Td5 SW Alpine White
More 19J Sensor Issues

Click image to enlarge
I had a Smiths Oil Temperature gauge (and sensor) fitted during the rebuild of my 110 pickup.
On the first long drive it indicated mid range temp. See photo.

Lately, the needle barely moves.

The sensor has a spade type connector which I note is not covered/insulated and also has some oil on it.

Could that cause a loss of signal and under reading? 2003 Defender 90 TD5 SW
1989 Land Rover 110 19J Turbo Diesel PU
Post #1066022 21st Apr 2025 7:56pm
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