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D3 Overheating issue
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Magnum310
 


Member Since: 09 Nov 2010
Location: South East
Posts: 17

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3
D3 Overheating issue

Hi all

Currently have a problem with D3 overheating under load. When under load/going up a hill the fan starts up, and the temperature guage goes from bang in the middle of the scale straight to the top within about a second, so no real warning, and on inspection coolant pouring out of expansion tank cap.

Has had a couple of new caps, have looked all over for leaks but only leaks are when its under load. I can sit in the car when its stationary and rev it continuously but shows no symptoms, but as soon as its out on the road it all happens again.

I've tried bleeding the coolant system multiple times, but doesn't seem to make any difference. Sometimes after road test the coolant is right down to the bottom, and sometimes it is right up to the cap, even after being left to cool down. No signs of water in oil and doesn't seem to smoke.


Any ideas? It's beginning to drive me wild now
  
Post #118570210th Nov 2013 10:57 pm
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stchris
 


Member Since: 13 Oct 2013
Location: Warwick
Posts: 335

England 2006 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3

Blocked rad by the sounds of it, may be worth trying a flush. Is the coolant a nice orange colour?
Then have the water pump out to inspect the impellar for damage (not pumping enough)
Or possibly a jammed thermostat but more likely one of the other two if only o/heating under load.
  
Post #118570910th Nov 2013 11:14 pm
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Magnum310
 


Member Since: 09 Nov 2010
Location: South East
Posts: 17

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3

To be fair it does looks like the coolant might be a little cloudy to me after its been run through the system. I've had the car a few months but when I first picked it up it was running on 'blue' coolant, which i gather can contribute to blocking the system somewhere?

I had it pressure tested by a garage which came back fine, they suggested maybe a head gasket/head issue so needless to say I'd like to explore the simpler options first!
  
Post #118571310th Nov 2013 11:30 pm
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Kingmav66
 


Member Since: 20 Jul 2010
Location: Gloucestershire
Posts: 1349

England 2006 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

EGR cooler(s) Thumbs Up
  
Post #118573211th Nov 2013 1:49 am
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

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

Check for hydrocarbons (bung someone at a garage or MoT station a tenner and use the emissions sniffer over an open coolant cap for a few seconds).

Use an IR thermometer to map temperatures across the radiator and coolant lines.

Check for correct operation of thermostat, pump and ECT sensor.

Check that the coolant lines are plumbed in correctly.

Thumbs Up
 Land Rover - Turning Drivers into Mechanics Since 1948

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Post #118575411th Nov 2013 7:15 am
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20713

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

I have a pair of EGR coolers gathering dust, if you need them Thumbs Up
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Post #118582211th Nov 2013 10:15 am
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Magnum310
 


Member Since: 09 Nov 2010
Location: South East
Posts: 17

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3

Cheers guys, very helpful as usual! I should have said that the car (an 07...) had a new LR engine in 2011 30,000 miles ago but on the job sheet only looks like one EGR valve was changed so other one could be a problem I guess.

I had the usual 'Low coolant level' for a while and so changed the bottle and cap as there seemed to be a bit of coolant excaping from the cap but it's never been this bad.

The first time that this happened in a big way I was nursing her home with the battery light on which turned out to be the alternator, but didnt make it back as she drained all her coolant - could that be linked?

All hoses are in place, no damage, will look into getting a hydrocarbon test Thumbs Up
  
Post #118586311th Nov 2013 11:43 am
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Ceekay
 


Member Since: 17 May 2009
Location: Bury
Posts: 2057

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Waitomo GreyDiscovery 4

I would of thought that if all your coolant went through the egr coolers and escaped into the the exhaust it would be smoking white smoke out the exhaust as mine did when that happened?
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Post #118602911th Nov 2013 4:37 pm
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Magnum310
 


Member Since: 09 Nov 2010
Location: South East
Posts: 17

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3

Bit of an update - Turns out to be a head gasket and probable cracked block, so she's well and truly stuffed. Don;t know whether to bother having a new lump put in or just sell it as is to be honest.
  
Post #118942018th Nov 2013 3:32 pm
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

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

Sorry to hear the news.

Did you get any warranty on the new engine as 2 years and only 30k is pretty shocking?

I would be more minded to get if fixed than just giving up, but I appreciate the pain.
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #118944118th Nov 2013 4:19 pm
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stchris
 


Member Since: 13 Oct 2013
Location: Warwick
Posts: 335

England 2006 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3

Ouch, sorry to hear that mate, do you know the mechanic well? If not I'd be tempted to get a second opinion.
  
Post #118962418th Nov 2013 9:33 pm
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Magnum310
 


Member Since: 09 Nov 2010
Location: South East
Posts: 17

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3

Hi all, think i'm getting over the shock!

I think it only came with the standard LR 1 year warranty unfortunately, so doesn't look like I have much comeback.

I ended it up sending it to 3 garages - first couldn't find a fault, 2nd thought maybe head problem but replaced coolant cap as it wasn't holding required pressure, and 3rd was a trip to main dealer who diagnosed gasket/block fault

Beginning to wish i kept my previous (slightly) more reliable D3! Crying or Very sad
  
Post #119071120th Nov 2013 9:45 pm
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Magnum310
 


Member Since: 09 Nov 2010
Location: South East
Posts: 17

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3

Another update - Just had it pointed out that where coolant was collecting on the bottle mount after coming out of the cap, looks like little bronzey coloured particles in it which look to be K-Seal/Steel seal or something similar - Could possibly have spotted it when i bought it which makes it worse!
  
Post #119385427th Nov 2013 4:36 pm
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TOMCAT102
 


Member Since: 29 Dec 2014
Location: INGATESTONE
Posts: 1

England 2007 Discovery 3 TDV6 Commercial XS Auto Zambezi SilverDiscovery 3

Hi, we are having the exact same issue with a D3. Did you get the head gasket sorted on yours? Did this solve the issue? Our one is showing no signs of a head gasket failure. We have fitted a new rad and thermostat, it will sit stationary revving at around 3,000 rpm all day with no issues. As soon as its underload temp goes right up and coolant then leaks from header tank cap.
Thanks
  
Post #186938717th Oct 2017 12:34 pm
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Globetrotter448
 


Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1771

Australia 2007 Discovery 3 4.0 V6 Petrol SE Auto Java BlackDiscovery 3

These use a thermostatic fan that runs when temp is up make sure that's happening. Try and stop the fan with a roll of newspaper - if it stops you have a problem.
  
Post #187075321st Oct 2017 5:11 am
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