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custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20652

Coolant loss, could it be the cap?

As above, my 90's been losing coolant lately fairy slowly but recently much much more.
Now from header tank fluid level to the very bottom of the tank in 12 days flat.

My first thought is a leak, but would the cap / any pressure lost through it be possible?

Or is the amount too much for that to be the case?

The cap once removed seems to usually be wet inside it for some reason.

Thoughts?

12th Feb 2016 9:14pm

Dave-H

Member Since: 08 Feb 2011
Location: Surrey
Posts: 1507

2007 Defender 90 Puma 2.4 HT Tonga Green

Couldn't say for definite with that much loss, but mine and a relative's both used to drop a couple of inches over a few weeks ... New caps on both solved the problem

For a sake of a few quid it's worth a try. Guns and Landrovers .... anything else is irrelevant.

13th Feb 2016 7:47am

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2663

2010 Defender 90 Puma 2.4 SW Alpine White

Mine was also losing coolant until I replaced the cap.

I now replace it every year, it's cheap

--
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

13th Feb 2016 7:57am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20652

Excellent guys, will try a new cap and got some new coolant on the way.

If it doesn't work, well, it was worth a go but it's possible.
It's the same cap that I've had since I've had it in 2010 so possibly from new.

Will see how it goes.

Thank-you.

13th Feb 2016 11:17am

d.tribe

Member Since: 11 Apr 2015
Location: hampshire
Posts: 9

My 2.2 110 is doing the same thing.

Does anyone happen to know the part number for the cap?

13th Feb 2016 7:48pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20652

Not off the top of my head, I have enquired with Dan @ Duckworth parts.
I can let you know probably as of Monday if you like?

13th Feb 2016 7:50pm

gazman

Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652

Mine was the cap. But it never went empty, just dropped about 2 to 3 cm and stayed there 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r

13th Feb 2016 8:00pm

d.tribe

Member Since: 11 Apr 2015
Location: hampshire
Posts: 9

Yeah that would be great. Thanks.

I've had a look online and can only find td5 or tdi part numbers.

Dave

13th Feb 2016 8:01pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20652

Will let you know after I hear back then.

13th Feb 2016 8:13pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20652

For those interested the P/N is: PCD100160

15th Feb 2016 1:34pm

DonH2000

Member Since: 12 Jan 2015
Location: North Kent
Posts: 551

2009 Defender 90 Puma 2.4 XS CSW Santorini Black

gazman wrote:
Mine was the cap......... just dropped about 2 to 3 cm and stayed there

Mine did the same so I replaced the cap twice.... in the end I had to change the expansion tank and now a year later not had a repeat of the problem and all is OK. Cheers Don.

15th Feb 2016 2:03pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20652

Well, small update.
Changed the cap, still the level of fluid is dropping so further investigation is required today.

25th Feb 2016 10:13am

Mash

Member Since: 09 Feb 2015
Location: Guernsey
Posts: 1674

I have a coolent pressure test kit and hopefuly won't be working this weekend if you are close to Aldershot.

90 wolf - Jasmin http://www.defender2.net/forum/topic39408.html
90 V8 - Maggie http://www.defender2.net/forum/topic42564.html
110 TD5 - Buggsy http://www.defender2.net/forum/topic59029.html
52HG25 lightweight https://www.defender2.net/forum/topic72342.html
D3 Hse - Fiona
Capri 2l S - Anna

Think I might have a problem............

25th Feb 2016 10:21am

Caterham

Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6324

2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey

I don't like over tightening things but from what I've seen this cap does need to be pretty tight.

hope you find the cause and it ain't too expensive / difficult to resolve.

25th Feb 2016 10:28am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20652

Mash - Thank-you for the kind offer but I am a long way away sadly.

I'm going to have a proper poke around today as I've got a day off anyway do I'll see what I can find.

Being orange OAT coolant it shouldn't be difficult to locate but I think it's out of sight hidden.

Doesn't help having orangey driveway grit either.

25th Feb 2016 10:37am

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