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WelshGas

Member Since: 01 Oct 2010
Location: Vale of Glamorgan
Posts: 935

2010 Defender 90 Puma 2.4 XS CSW Santorini Black

Coolant system advice, please!

I've recently had some problems with the cooling system over the past few weeks and need some advice.
1. Overheating with a cold radiator. Thermostat changed as was found to be jammed closed. Replaced.
2. Steam from bonnet as fluid lost via expansion tank cap due to leak in the EGR cooler. Cooler bypassed. . Solved?
Have done a number of trips since and temperature varies between 76 and 82c depending on driving style, BUT water level drops in expansion tank from Cold Level mark when warm and returns to Cold level when left overnight. If the Defender is left for a few hours until radiator is just warm then coolant level is still below Cold Level but if pressure cap is removed slowly then you can hear pressure being released and the level rises to the Cold Level mark.
IS THIS NORMAL or do I still have a problem. There is NO visible leak and the Defender runs sweetly at all speeds, and the coolant level always returns to the Cold Level mark.
Any advice would be much appreciated.

LANDYWATCH

Neighbourhood Watch for Land Rover Owners

http://www.landywatch.co.uk/smf2/index.php

31st May 2014 6:47pm

willy eckerslike

Member Since: 15 Jun 2009
Location: North yorks
Posts: 1789

2007 Defender 110 Puma 2.4 HCPU Keswick Green

Air in the system is my guess, quite hard to get rid of. Original Member Pie n Pea Club.
110 HCPU Tipper

31st May 2014 7:06pm

munch90

Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

after running for a while enough to get to running temp , you shouldn't get a lower temp then what the thermostat is set at , should be 82c
so either thermostat is not right or air problems

on the thermostat one end has one pipe the other has two pipes , are the pipes fitted the right way round on the side with two pipes ( should be hard to get them wrong as one is at a angle ) the reason I ask is when to thermostat opens one of these pipes get blocked off ( blocks primany circuit and opens secondry circuit ) and if fitted wrong would give problems with flow

31st May 2014 7:35pm

WelshGas

Member Since: 01 Oct 2010
Location: Vale of Glamorgan
Posts: 935

Thanks for the info. All the pipes seem to pressurise when engine running. Checked the bleed valve by the heater valve, took a while until coolant came out. Munch90, the pipes on the thermostat seem correct, as you said it would be difficult to fit incorrectly. As regards the temperature, it only drops when stopped idling or travelling at low revs eg 30mph in 6th, normally 80 to 82c when driving. Heater works well.
If there was air in system then I presume that as it warms up that would expand BUT as system gets pressurised would get compressed. Definitely confused

LANDYWATCH

Neighbourhood Watch for Land Rover Owners

http://www.landywatch.co.uk/smf2/index.php

31st May 2014 9:24pm

Whitewaitress

Member Since: 26 Nov 2013
Location: Liverpool
Posts: 47

Have you tried draining the system, opening the fuel cooler lines under the passenger side of the chassis, flushing and re-filling? You may have a blockage in one of the smaller pipes.

When you start the engine from cold, with the cap off the expansion tank, can you see steam / white smoke?

2nd Jun 2014 7:10am

WelshGas

Member Since: 01 Oct 2010
Location: Vale of Glamorgan
Posts: 935

Whitewaitress, nothing from expansion tank when starting up with cap off. Fluid level now only drops about 1 cm when upto temperature and pressurised and returns to normal level when totally cold. I am going to get the EGR cooler replaced shortly and hopefully recharge the coolant system without any air locks. We'll see what happens then.

LANDYWATCH

Neighbourhood Watch for Land Rover Owners

http://www.landywatch.co.uk/smf2/index.php

2nd Jun 2014 7:51pm

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