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is the coolant system pressurised in a D4?
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Ben4
 


Member Since: 28 Apr 2017
Location: Buckinghamshire
Posts: 934

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Santorini BlackDiscovery 4
is the coolant system pressurised in a D4?

I ask as I keep getting the 'coolant low' message on the dash - I popped the bonnet and the level was really low. engine was hot.
I slowly released the cap and the pressure shot back up well within spec.

resulting in error message gone.

advice / thoughts welcome!
thanks formerly Disco3Ben

2016 D4, Santorini Black
2007 D3, Black - sold  
Post #217402715th Sep 2020 7:43 pm
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

Yes.

Did you mean to say, the level shot back up to well within spec?  
Post #217402815th Sep 2020 7:44 pm
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Dondiddy
 


Member Since: 26 Dec 2019
Location: Hamilton
Posts: 309

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Yulong WhiteDiscovery 4

Remember that the coolant needs to be cold when the level is checked. It might just need topped up. Thumbs Up  
Post #217407916th Sep 2020 8:48 am
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dewillia
 


Member Since: 04 Aug 2019
Location: Wolverhampton
Posts: 71

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Stornoway GreyDiscovery 4

Renowned fault caused by faulty float in expansion tank, easy fix  
Post #217417116th Sep 2020 4:17 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10690

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Yeah replace tank as float inside  
Post #217417716th Sep 2020 4:39 pm
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Kilovolt
 


Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1072

United Kingdom 2013 Discovery 4 3.0 SDV6 Commercial XS Auto Baltic BlueDiscovery 4

I bought the tank from advanced factors a few weeks ago and changed it for the same reason. Fixed the issue straight away.

Remove the passenger headlight and it makes life much easier. You’ll need two pairs of mole grips (to nip the top and bottom pipes) to minimise coolant loss to very little.

A set of of these is also a god send.



Good luck Thumbs Up "Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"

Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything Smile
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power) Smile  
Post #217418416th Sep 2020 5:11 pm
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