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238kirk



Member Since: 03 Nov 2012
Location: Doncaster
Posts: 233
United Kingdom 2003 Defender 90 Td5 SW Belize Green
Well I had a look the other night and the earth near the ecu looked dodgy on mine so I took it off, cleaned it up and put it back on, checked round all the sensors and all looked ok, did an 80 mile run yesterday and a 100 mile run today both with a trailer on and all seems fine, no flickering and no hot start probs...... Strange
Post #215650 2nd Mar 2013 9:15pm
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Gelert7233



Member Since: 17 Nov 2013
Location: Uk
Posts: 8
excossack wrote:
Looking at the wiring diagram in the Haynes manual and it looks like there are two coolant temp sensors?

Wiring Diagrams
13.25 Diagram 3 item 32 - Coolant temp sensor with 2 wires. Pink/Black and Pink/Green feeding the ECU on terminals c158/8 and c158/7

13.27 Diagram 5 item 52 - Engine Coolant temp sensor with 2 wires. Green/Blue (then changes to Light Green/Blue) and Earth feeding the instrument cluster on terminals cc1052/2. Earthing on terminal c1052/1 to point earth point E2 and a wire from c1052/3 to Fuse 15, passenger fusebox.


So are there two temp sensors?
Is the passenger fuse box the one behind the gear stick?
Post #282950 17th Nov 2013 5:58pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Ok......? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #282984 17th Nov 2013 6:52pm
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Gelert7233



Member Since: 17 Nov 2013
Location: Uk
Posts: 8
Not sure what happened on the last post!!
But I've got the exact same problem as you had with the temp guage. Did you manage to located the problem?? I've changed the water pump this morning and it's still playing up!! Crying or Very sad
Post #282991 17th Nov 2013 7:07pm
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039
Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
I would guess it is an electric problem not mechanical. Are all connection behind the dash still OK as I had the spedometer connection partly coming loose and had very strange reactions form all sensors in the dash.


Laurie wrote:
The guage is analog up to the 'just under halfway' point, after which it becomes digital.
It will remain at the 'just under halfway' point until the temperature reaches 105°, above which it will go directly into the red and put the engine into 'limp' mode.


I noticed that too, I was thinking my gauge was broken. Normally it's fine standing steady just under halfway but if I get stuck in deep mud and try te get out for a while the td5 gets warm as it needs to work spinning the 35" simexes and then suddenly the temp gauge jumps up and I loose power.
I was thinking about changing out the gauge but clearly nothing is wrong with it.
Maybe I should install another independend gauge instead.

Somwhere was mentioned that the td5 radiator is just sufficient, are there better once? Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #282995 17th Nov 2013 7:17pm
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Gelert7233



Member Since: 17 Nov 2013
Location: Uk
Posts: 8
Thanks Roel. I will take a look at the wiring tomorrow, I've checked the earth point and given them a good file and clean. But it's still doing its own thing. The temp will rise up to 1/4 then jump back down to bottom, it never goes over half way. So it's currently off road untill I get this sorted .. I've been thinking the head gasket. I just hope it's something simple!!
Post #282998 17th Nov 2013 7:24pm
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039
Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
If you coolant level is OK and you don't see anything strange in that area, I would think it would be electrically.

Can't you borrow a diagnostics system from somebody so you can read the temp values while driving? It will probably give you the same values as you read the ECU values. Shocked Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #283007 17th Nov 2013 7:34pm
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Gelert7233



Member Since: 17 Nov 2013
Location: Uk
Posts: 8
It had been using some water, that's one of the reasons I bought the water pump, then the pump developed a noise!! Which I thought could be bearing, But driving home last night this problem occurred so the first think I did this morning was to fit the pump. Got 4 bolts off easy up till the last bolt which snapped!! Took me a good hour to get it out.. Anyway fitted it all back topped up with coolant and water, bled the system left it running for around 45 mins checking the temp every 10 mins. All seemed fine until I moved it off the drive max 10 yards and gauge was dancing again!
I'm thinking of taking it up to a head specialist to do a pressure test on it, just to rule a few things out hopefully.. As I don't have the tools here to do it myself. Crying or Very sad
Post #283014 17th Nov 2013 7:46pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Gelert7233 wrote:
Not sure what happened on the last post!!
But I've got the exact same problem as you had with the temp guage. Did you manage to located the problem?? I've changed the water pump this morning and it's still playing up!! Crying or Very sad


I did solve it, by replacing the coolant temp sensor in the top hose. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #283025 17th Nov 2013 8:12pm
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Gelert7233



Member Since: 17 Nov 2013
Location: Uk
Posts: 8
Great news!! It's one of them things where you've got to check everything, I will give that a go tomorrow hope it will sort it. Will keep you posted Thumbs Up
Post #283027 17th Nov 2013 8:16pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Its the same temp sensor that's used in the fuel pressure regulator 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #283032 17th Nov 2013 8:22pm
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Gelert7233



Member Since: 17 Nov 2013
Location: Uk
Posts: 8
Thanks . You say it's located in the top hose, where exactly is that? I've not got a manual yet! Is thee just the one sensor for the gauge?
Post #283044 17th Nov 2013 8:57pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Remove the engine cover and standing at the front facing the engine, the sensor is the front right hand corner of the engine where the top water hose comes to the head.
I'm sure it is just one sensor for the gauge 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #283049 17th Nov 2013 9:05pm
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Gelert7233



Member Since: 17 Nov 2013
Location: Uk
Posts: 8
Thanks for the help!! Smile hope it's the sensor.
Post #283051 17th Nov 2013 9:07pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Hope this will help (brown plug in the blue circle)



PS not my picture, blagged from google images 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #283055 17th Nov 2013 9:13pm
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