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Bluest



Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4209
United Kingdom 2007 Defender 110 Puma 2.4 XS CSW Java Black
Coolant leaking around expansion tank cap.
I seem to be losing a small amount of coolant out of fill cap on the expansion tank. There is always a small amount of coolant on the outside of the tank around the cap. It leaks enough that I do have to add a bit of coolant between service, not a lot, but it does bother me. Faulty cap or a sign of serious impending doom? 2007 110 TDCi Station Wagon XS
Post #597372 29th Jan 2017 5:38pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20348
United Kingdom 
Change the cap, IIRC they have a PRV built in that can go haywire.

They are quite cheap. $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪
Post #597375 29th Jan 2017 5:42pm
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Dave-H



Member Since: 08 Feb 2011
Location: Surrey
Posts: 1507
England 2007 Defender 90 Puma 2.4 HT Tonga Green
Common issue, as Steve says the cap is knackered.
Replace it .... and it's one of the few items where a pattern part is better than genuine Thumbs Up Guns and Landrovers .... anything else is irrelevant.
Post #597380 29th Jan 2017 5:57pm
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Bluest



Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4209
United Kingdom 2007 Defender 110 Puma 2.4 XS CSW Java Black
Any particular make of aftermarket cap? Google only shows Britpart... 2007 110 TDCi Station Wagon XS
Post #597403 29th Jan 2017 6:45pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20348
United Kingdom 
Genuine isn't very expensive, I bought one myself last year.

Try Dan @ Duckworth parts.

Thumbs Up $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪
Post #597437 29th Jan 2017 7:39pm
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DonH2000



Member Since: 12 Jan 2015
Location: North Kent
Posts: 551
United Kingdom 2009 Defender 90 Puma 2.4 XS CSW Santorini Black
When I bought mine it leaked so I bough a new cap and it still leaked, so I bought another cap and that too still leaked. In the end I bought a new coolant tank and all has been OK since then so it was not the cap!!!!

At least I have some spare caps now! Cheers Don.
Post #597662 30th Jan 2017 4:29pm
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o4dn



Member Since: 08 Jan 2010
Location: South West
Posts: 538
France 2009 Defender 90 Puma 2.4 SW Alaska White
Dave-H wrote:
Common issue, as Steve says the cap is knackered.
Replace it .... and it's one of the few items where a pattern part is better than genuine Thumbs Up

True! Mine stopped leaking once I fitted a britpart cap in dispair! (had previously replaced with two genuine ones and it was still leaking...) “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique.
--
2009 2.4 Puma Defender 90 SW
1979 Land Rover Series 3 88"
Post #597663 30th Jan 2017 4:35pm
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Bluest



Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4209
United Kingdom 2007 Defender 110 Puma 2.4 XS CSW Java Black
Because I'm a glutton for punishment, I've ordered a genuine one, 10. If it doesn't work I'll go Britpart. 2007 110 TDCi Station Wagon XS
Post #597703 30th Jan 2017 6:24pm
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AlanH



Member Since: 15 Mar 2010
Location: WA
Posts: 242
Australia 
My 2010 110 leaks and has done for the last 173K (kays not miles) and I've never bothered replacing it. Every time I topped up the expansion tank it promptly lost about 2cm but never any more.
I've reached the conclusion that that is the correct level and just left it.
AlanH.
Post #597955 31st Jan 2017 8:59am
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pme



Member Since: 06 Jan 2016
Location: cambridge and mainly ariege
Posts: 49
United Kingdom 2007 Defender 90 Puma 2.4 SW Tonga Green
HI
exactly the same issue on my 2007 2.4, did look like the expansion vessel initially but bought the cheapest cap i could find as a quick check, 3.75 on ebay. Put it on about 2k ago, perfect.
Post #598648 2nd Feb 2017 5:56pm
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Bluest



Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4209
United Kingdom 2007 Defender 110 Puma 2.4 XS CSW Java Black
My luxurious 10 genuine Land Rover one arrived today. I'll let you know if it works. If not I'll get a cheapo and one. 2007 110 TDCi Station Wagon XS
Post #598658 2nd Feb 2017 6:32pm
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Fat Cog



Member Since: 19 Mar 2012
Location: Oxfordshire & Devon
Posts: 502
United Kingdom 2016 Defender 90 Puma 2.2 HT Corris Grey
My 2008 Puma did it from new, had the cap changed under warranty but it continued to leak for the 9 years or ownership & it never really bothered me...no leaks so far on my 2016...repeat so far!!!! Since 1973...S1, Air Portable's, Defender's, but only my Wolf TUL HS GS remains
Post #598661 2nd Feb 2017 6:45pm
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Naks



Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2638
South Africa 2010 Defender 90 Puma 2.4 SW Alpine White
the coolant cap should be considered as a service item, and changed every year Thumbs Up --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ
Post #598771 3rd Feb 2017 8:45am
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Bluest



Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4209
United Kingdom 2007 Defender 110 Puma 2.4 XS CSW Java Black
New genuine cap seems to have rectified the issue. Did a few hours driving yesterday and no sign of leakage. Wonder how long it will last? 2007 110 TDCi Station Wagon XS
Post #599228 5th Feb 2017 12:44pm
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ericvv



Member Since: 02 Jun 2011
Location: Near the Jet d'Eau
Posts: 5816
Switzerland 2009 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black
Naks wrote:
the coolant cap should be considered as a service item, and changed every year Thumbs Up


Really? Original factory cap, and never had a leak in more than 8 years.
Eric You never actually own a Defender. You merely look after it for the next generation.
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https://m.youtube.com/watch?v=dxwjPuHIV7I
https://vimeo.com/201482507
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Post #599266 5th Feb 2017 3:14pm
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