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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6573
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
Td5 running cool / overcooling
Just noticed yesterday on a motorway run that the temperature gauge was reading lower than normal.

Yes, I'm aware that Td5s normally read just to the left of vertical (and it always has until yesterday) but this is significantly further round to the left than that.

I'm thinking that this can't be anything else but a duff thermostat? Seems to warm up OK though Confused

Pic just after getting off motorway:


Click image to enlarge  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #262358 30th Aug 2013 10:23am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5819
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I do have a document showing the resistance values for the temp sensor if thats any help? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #262369 30th Aug 2013 11:22am
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bpman



Member Since: 21 May 2008
Location: Oslo
Posts: 8069
2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black
When you are off the motorway is the temp ok?

Have you checked the coolant level?

With the engine running, gently unscrew the air bleed screw on the coolant hose .. Hopefully some water will come out ...

Check your viscous fan?
Post #262370 30th Aug 2013 11:55am
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Lou Sparts



Member Since: 15 Apr 2012
Location: Kent
Posts: 1501
United Kingdom 2005 Defender 90 Td5 XS CSW Zambezi Silver
Mine always runs about there summer and winter changing the thermostat made no difference Sad 2005 Td5 90 XS

Steve
Post #262477 30th Aug 2013 8:29pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6573
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
John, the data would be handy, yes please - can't find any info in RAVE.

Done all the usual checks but nothing showing up Confused  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #262581 31st Aug 2013 10:22am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5575
2006 Defender 110 Td5 USW Zermatt Silver
Are all other gauges, lights ok? Could it be an earth issue? My temp gauge will twitch when I turn something else on or off.

Andy
Post #262582 31st Aug 2013 10:25am
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james975



Member Since: 07 Nov 2009
Location: Edinburgh
Posts: 53
Scotland 2000 Defender 90 Td5 HT Epsom Green
I had the same problem.
It was the earth under the drivers seat next to the ecu.
cheers James
Post #265745 11th Sep 2013 6:54pm
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jimbob7



Member Since: 06 Jul 2013
Location: uk
Posts: 2055
Mine sits about there.
Post #265747 11th Sep 2013 6:57pm
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Will.I.AM



Member Since: 16 May 2013
Location: Hertfordshire
Posts: 365
United Kingdom 2005 Defender 130 Td5 HCPU Kaikoura Stone
my temp always sits there, and when i have been booting it for a small while or towing up a hill it does raise slightly, it must be ok, coz my kenlow coincides with that and starts when the needle has gone up a fraction.
Post #269762 27th Sep 2013 2:51pm
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Paulv8



Member Since: 09 Jun 2013
Location: Milton Keynes
Posts: 618
1989 Defender 90 V8 Petrol CSW Alpine White
It could be a broken spring in the fuel cooler? Just seen this on a 99 disco.
Post #269803 27th Sep 2013 6:02pm
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