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johannes



Member Since: 13 Mar 2023
Location: Kokkola
Posts: 6

Finland 2009 Defender 110 Puma 2.4 SW Stornoway Grey
Which one temperature sensor?
Hello from Finland!

I'm a new Defender owner and this is my first post here.

My Defender has a faulty temperature gauge. The pointer does not move at all in the instrument panel. I think I have to change the temperature sensor first. My question is, which one do I need? Coolant sensor or engine temperature sensor? There is two different sensors.




Post #985363 13th Mar 2023 10:17am
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johannes



Member Since: 13 Mar 2023
Location: Kokkola
Posts: 6

Finland 2009 Defender 110 Puma 2.4 SW Stornoway Grey
I finally found a similar discussion by search:
https://www.defender2.net/forum/post559882.html

It looks like my Defender has only a cylinder head sensor.
Post #985367 13th Mar 2023 10:49am
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MMR1988



Member Since: 29 Oct 2016
Location: Chemnitz
Posts: 54

Germany 2008 Defender 110 Puma 2.4 SW Alaska White
Yes, the Puma engine has only a cylinder head sensor.

I assume it’s your combi instrument, that doesn’t work properly.
You can check this by adding a OBD II Reader to the OBD port and check what values you’ll get for the cooling temp.

/Max
Post #986072 19th Mar 2023 7:52am
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johannes



Member Since: 13 Mar 2023
Location: Kokkola
Posts: 6

Finland 2009 Defender 110 Puma 2.4 SW Stornoway Grey
Thanks! Is that typical fault in Puma instrument panel? Does the sensor control something other than just a pointer on the instrument panel?
Post #986073 19th Mar 2023 8:07am
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hornet



Member Since: 04 Jan 2010
Location: Western Europe
Posts: 361

The sensor is generally used for engine control, not only for the instrument cluster. For more information check workshop-manual.
Follow the advice an check the readings with an OBD-Reader/Nanocom to ensure correct values.
Post #986074 19th Mar 2023 8:19am
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MMR1988



Member Since: 29 Oct 2016
Location: Chemnitz
Posts: 54

Germany 2008 Defender 110 Puma 2.4 SW Alaska White
Not very common but it happens from time to time and at least the ECU uses these temps.
The gauge in the instrument shows a somehow calculated value of several sensor anyway. So it’s not really a water temp gauge.
As written above you can simply use a OBD reader for replacement if the sensors work correctly. I use a scangauge II some others use an ultragauge (which can be even fitted in the instrument cluster - there is an instruction somewhere in this forum.)
And of course there are some special garages that can fix the gauge.
Post #986075 19th Mar 2023 8:19am
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20413

United Kingdom 
This one:
https://www.lrparts.net/lr039220-engine-te...-puma.html
I’d recommend Genuine, it’s likely if the gauge is not working the above CHT sensor has failed, it measures water and head temp.
It’s likely that you have higher fuel consumption due to its failure too, though over time it can be difficult to tell.

Remember to only replace it when engine is cold, and keep the coolant tank cap on as a little coolant can be lost so a top up on hand is ideal.
It’s the best place to start, as it’s relatively cheap but a little difficult to get at.
You might want the associated socket to do the job, or just send it in to a garage to do it for you.
It’s located to the rear of the engine cover, slightly to the right on the back of the engine block near the upper bulkhead area.
You can easily trace it by its cable and piece of convoluted tube for protection, and electrical connector under the engine cover rear.

It’s likely the best place to start. Thumbs Up $W33T $0U7H3RN $UG4R
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Post #986116 19th Mar 2023 7:07pm
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johannes



Member Since: 13 Mar 2023
Location: Kokkola
Posts: 6

Finland 2009 Defender 110 Puma 2.4 SW Stornoway Grey
Thanks! I'll start by replacing the sensor. Great if the fuel consumption also decreases at the same time.
Post #986117 19th Mar 2023 7:24pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20413

United Kingdom 
Good luck, I think it’s a good probability that it will be the issue. $W33T $0U7H3RN $UG4R
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Post #986118 19th Mar 2023 7:53pm
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ickle



Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1784

France 2008 Defender 110 Puma 2.4 CSW Alpine White
I did mine yesterday, its a bit of a pig!

Bonnet either off or as high as the garden rake will hold it securely (rope over the top onto the spare wheel as a safety measure)

Small steps or hop up for the right access height

if you can find a 15mm combination spanner to sacrifice, lob it in half, then put a cut through the ring to allow the cable through, then you can do it by feel as access is really awkward!

Best of luck!

Keith
Post #986129 19th Mar 2023 9:05pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20413

United Kingdom 
You are not the only one to say it’s a pain of a job, I had a look myself some weeks ago and thought what a pain to get at being where it is.
At least the electrical connector and wire tail makes it easier to locate. $W33T $0U7H3RN $UG4R
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Post #986132 19th Mar 2023 9:19pm
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Ianh



Member Since: 17 Sep 2018
Location: Essex
Posts: 2019

United Kingdom 
Would a 15mm oxygen sensor socket help ? Or a Laser Tools 6870 Cylinder Head Temperature Sensor Socket- 15mm ? https://www.lasertools.co.uk/Product/6870/...-15mm-Ford

Note:- a trick I use when using these types of sockets on stubborn sensors is to use a jubilee clamp on the bottom of the socket once it is in place, then tighten it so the socket can’t open and slip if higher levels of torque are needed. For this application I don’t expect you will need to do this, however on oxygen sensors on an exhaust it’s useful as the temps and rust tend to fuse the sensor to the exhaust.

Also a little plus gas penetrating oil on the sensor 10 mins before I apply torque.

This is a good topic relating to the 2.4 CHT sensor, pictures on its location, and how to test it. https://www.defender2.net/forum/topic13014.html?highlight=2+2+cht
Post #986135 19th Mar 2023 10:30pm
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johannes



Member Since: 13 Mar 2023
Location: Kokkola
Posts: 6

Finland 2009 Defender 110 Puma 2.4 SW Stornoway Grey
Changing the cylinder head temperature sensor did not fix the problem. I opened the instrument cluster. The solder joints seem to be good, but the circuit board has a brown stain. Does it indicate broken components? There is clearly glue on the component side. Are stains on the solder side probably glue also?



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Post #986387 22nd Mar 2023 8:27am
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