Discovery II TD5 coolant pressurised

Hi I am getting a sloshing sound coming fro the heater. The heater still works. I have tried bleeding it but can't get rid of it. Recent replacement: water pump, radiator and four hoses (to cure overheating) The car runs well is not overheating now. But, after leaving it for over 12 hours the coolant is still under pressure. Prior to the recent repairs my garage carried out a test to see whether there was exhaust gas in the coolant resulting in passing the test.

Hi Geoff

Lets ask A nice moderator to move thsi post over to the Disco section rather than the Series Landy section...

You say those parts were replaced to fix the overheating, how bad was it? what was the actual cause of the overheating?

Cheers

Also, you say you tried bleeding it,

Did you follow the instructions in Rave fully, mine took a few goes to bleed fully.

Cheers

neilly said:

Hi Geoff

Lets ask A nice moderator to move thsi post over to the Disco section rather than the Series Landy section...

You say those parts were replaced to fix the overheating, how bad was it? what was the actual cause of the overheating?

Cheers

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Thanks neily. The car had a head gasket replaced under warranty in May last year. But I have had trouble since. Leaking hose,possible duff thermostat, split hose and pinhole in another hose four hoses replaced, failure of water pump and then radiator blocked. So the cause of the overheating was due to coolant loss. The garage says that oil in the hoses leads to softening (they are probably all as old as the car)

neilly said:

Hi Geoff

Lets ask A nice moderator to move thsi post over to the Disco section rather than the Series Landy section...

You say those parts were replaced to fix the overheating, how bad was it? what was the actual cause of the overheating?

Cheers

Click to expand...

neilly said:

Also, you say you tried bleeding it,

Did you follow the instructions in Rave fully, mine took a few goes to bleed fully.

Cheers

Click to expand...

Yes I have studied the recommended method. I have also been parking the car on a slope - bonnet higher and each time I use it I try to bleed some more air out. There is always a little coming out. Since the coolant is still under pressure after leaving the car for 12 hours it does seem as if air or exhaust fumes are entering the coolant system again.

HAVE it sniff tested & try changing expansion tank top !

Magicgrotto said:

HAVE it sniff tested & try changing expansion tank top !

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Hi Since the coolant is pressurised even after leaving the car for over 12 hours why would I suspect the expansion tank cap? Are you thinking it might not be opening to let pressure out? Sniff test? Yes the garage did it last time, not so long ago, and I had a bill so I could save myself some money a buy a kit myself

Buy a kit & A cap at the same time ! Two tiny valves in cap & with age they don't work !

Well the cap is only a year old but it could fail so I have just bought one on eBay

Magicgrotto said:

Buy a kit & A cap at the same time ! Two tiny valves in cap & with age they don't work !

Click to expand...

Second on the cap. Is it using any water still?

If its pressurised that much it should overflow out to the open ended pipe.

I stick a bottle over it with a hole in the cap to check if the pressure is too high and water is escaping through the over pressure vent pipe.

But that will only work if the cap is working correctly.

Simon098 said:

Second on the cap. Is it using any water still?

If its pressurised that much it should overflow out to the open ended pipe.

I stick a bottle over it with a hole in the cap to check if the pressure is too high and water is escaping through the over pressure vent pipe.

But that will only work if the cap is working correctly.

Click to expand...

No its not using any water.

geoff edwards said:

No its not using any water.

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Change the cap, they're only about £5

If it starts using water when you change that, then like I said earlier, put a bottle under the vent pipe and check it regularly.

Simon098 said:

Change the cap, they're only about £5

If it starts using water when you change that, then like I said earlier, put a bottle under the vent pipe and check it regularly.

Click to expand...

Thanks I have bought a new cap today.

Two vents under cap Geoff ! 1 vents out when hot, 1 vents in when cooling down !

Magicgrotto said:

Two vents under cap Geoff ! 1 vents out when hot, 1 vents in when cooling down !

Click to expand...

thanks for that info

Magicgrotto said:

Two vents under cap Geoff ! 1 vents out when hot, 1 vents in when cooling down !

Click to expand...

Maybe on other vehicles... the D2's tank cap has only one pressure release valve which should open at 1.4 bar. The sniff test on diesels can be irrelevant in some cases

sierrafery said:

Maybe on other vehicles... the D2's tank cap has only one pressure release valve which should open at 1.4 bar. The sniff test on diesels can be irrelevant in some cases

Click to expand...

The pressure cap is the same as that fitted to a few other Land rover vehicles, it vents at 15 PSI and is designed to fail completely at 22 PSI to prevent system damage.

Then it seems that the workshop manual is wrong
that's why that 140 is stamped on it cos it means the pressure limit in KPa: http://www.ebay.co.uk/itm/Genuine-O...530271?hash=item211ba21e9f:g:-5UAAOSwo4pYQDUJ

Well possibly, seeing as how it is the same cap fitted to several Land rover models all with the same operational description, but different than that for the TD5. PCD000070 is the part number.

For those fitted with PDC000070(Defender/D2 Td5, 4.0 V8, RR P38 2.5 DSE) the description is the same, only about prerssure relief valve at 140KPa(20psi) as stamped on the cap albeit on some sites it's listed as used for L322 too and the description for that it's different