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Coolant loss from 2006 TDV6 Disco 3 and no outward signs.
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Cropwell
 


Member Since: 12 Dec 2017
Location: Derbyshire
Posts: 5

United Kingdom 2006 Discovery 3 3.0 TDV6 HSE Auto Zermatt SilverDiscovery 3
Coolant loss from 2006 TDV6 Disco 3 and no outward signs.

I have a problem with our D3 - TDV6 2006. It is loosing coolant but there are no outward signs. The coolant system holds pressure when tested but it does drop when the vehicle is driven. I have had a garage take a look and all of the pipes have been checked with no signs of coolant loss (including at the rear heater matrix). I have had a couple of 'low coolant' warnings, but no elevated temperature dial readings. I have removed the engine cover and there are no signs of coolant residues around the plastic manifold at the top of the front of the engine. Not really done a scientific test, but possible 0.5 litres in 20 miles.

Any ideas? - Thanks in advance.
  
Post #188942312th Dec 2017 1:50 pm
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Robbie
 


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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

EGR coolers would be my first thought as the leak would be internal to the exhaust.
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Post #188942812th Dec 2017 2:02 pm
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Cropwell
 


Member Since: 12 Dec 2017
Location: Derbyshire
Posts: 5

United Kingdom 2006 Discovery 3 3.0 TDV6 HSE Auto Zermatt SilverDiscovery 3

Thank you - I had thought that could be an issue, but having spoken to two Land Rover specialists in the area, both said that they had never had to replace those components on a D3 and I was just looking for other possibilities.

I should have said, the oil looks OK and is not being used at an elevated rate.

I think we are on 70,000m at present.
  
Post #188944012th Dec 2017 2:24 pm
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ds23man
 


Member Since: 19 Jan 2013
Location: Ainum
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Netherlands 2007 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

That's a lot off coolant. Gearbox oil cooler?
  
Post #188945412th Dec 2017 3:00 pm
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Cropwell
 


Member Since: 12 Dec 2017
Location: Derbyshire
Posts: 5

United Kingdom 2006 Discovery 3 3.0 TDV6 HSE Auto Zermatt SilverDiscovery 3

Gear changes appear to be OK still and no obvious loss of gearbox performance.....

The loss figure was a very rough estimate.... the filler reservoir is very hard to see and I did over-fill and have to drain a couple of times (using a rubber pipe from the reservoir).

There is no pressure in the system after a drive....
  
Post #188945712th Dec 2017 3:04 pm
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ds23man
 


Member Since: 19 Jan 2013
Location: Ainum
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Netherlands 2007 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

If there is no pressure when the engine is hot and switched of, you have a big problem. Did they do a CO check off the coolant?
  
Post #188946212th Dec 2017 3:22 pm
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SpiderBaby
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Member Since: 21 Sep 2007
Location: Liverpool
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England 2005 Discovery 3 TDV6 SE Auto Zermatt SilverDiscovery 3

OK - this is very likely NOT your problem but I had something similar a while back.

I replaced the coolant header tank but NOT the pressurised cap. Had a bloody annoying 'chuffing' noise but only when the engine was hot and thought little of it.

Then I popped the bonnet and found the coolant level really low - probably just above the level the warning light would have triggered.

It transpired the cap, while tight when cold, wasn't sealing properly when heat and pressure increased. As a temporary (actually ongoing Whistle ) fix I wrapped a thick elastic band around the neck of the tank and to date have had no more loss (or bloody noise...).

Thing was there was no trace of leaking coolant in the engine bay, engine oil or anywhere else.
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Post #188951112th Dec 2017 4:49 pm
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Cropwell
 


Member Since: 12 Dec 2017
Location: Derbyshire
Posts: 5

United Kingdom 2006 Discovery 3 3.0 TDV6 HSE Auto Zermatt SilverDiscovery 3

ds23man wrote:
If there is no pressure when the engine is hot and switched of, you have a big problem. Did they do a CO check off the coolant?


Not that I am aware of yet......And what might that problem be? Head?
  
Post #188952112th Dec 2017 5:12 pm
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Cropwell
 


Member Since: 12 Dec 2017
Location: Derbyshire
Posts: 5

United Kingdom 2006 Discovery 3 3.0 TDV6 HSE Auto Zermatt SilverDiscovery 3

SpiderBaby wrote:
OK - this is very likely NOT your problem but I had something similar a while back.

I replaced the coolant header tank but NOT the pressurised cap. Had a bloody annoying 'chuffing' noise but only when the engine was hot and thought little of it.

Then I popped the bonnet and found the coolant level really low - probably just above the level the warning light would have triggered.

It transpired the cap, while tight when cold, wasn't sealing properly when heat and pressure increased. As a temporary (actually ongoing Whistle ) fix I wrapped a thick elastic band around the neck of the tank and to date have had no more loss (or bloody noise...).

Thing was there was no trace of leaking coolant in the engine bay, engine oil or anywhere else.



I have replaced the cap in case that was the issue..... so unless both caps are faulty, it is not that. However, if it is the bottle/tank and not the cap, then it could be....
  
Post #188952312th Dec 2017 5:14 pm
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Bodsy
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United Kingdom 2007 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Check the Water Outlet Assembly. Common for it to split at the vibration weld and leak where you can’t see it.

It’s under the air inlet Y piece on top of the engine.
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Post #188960312th Dec 2017 7:29 pm
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DSL
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Ukraine 

This bit?

Click image to enlarge


As happened 8,000' up a mountain in Andorra, in snow and a thunderstorm. Was an epic recovery, if I do say so myself. Whistle

   
Post #188960412th Dec 2017 7:32 pm
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anglefire
 


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England 

You should have been sat where I was Del! Laughing
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Post #188973913th Dec 2017 6:51 am
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L319
 


Member Since: 14 Dec 2013
Location: Herefordshire
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United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

I had a very small coolant loss from my 05MY D3, needed a slight top up in between and at each service. Changed the cap and it has stopped.
  
Post #188975613th Dec 2017 8:42 am
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KostasA
 


Member Since: 23 Aug 2015
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Greece 

Robbie wrote:
EGR coolers would be my first thought as the leak would be internal to the exhaust.


i had same issue as described by Robbie. to me it worths investigation.
  
Post #188983713th Dec 2017 2:01 pm
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DSL
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Member Since: 11 May 2006
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Ukraine 

anglefire wrote:
You should have been sat where I was Del! Laughing


No ta!! Was quite happy with you two on the tow rope behind me. With heating, heated seats and steering wheel all nicely on. Whistle
   
Post #188983913th Dec 2017 2:04 pm
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