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Coolant level warning light
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jamez79
 


Member Since: 03 Sep 2018
Location: Staffordshire
Posts: 565

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Indus SilverDiscovery 4
Coolant level warning light

Hi,

I have the "low coolant" warning light pop up on the dash under heavier than normal acceleration.

I've read the posts on here about the sensor/level taking on fluid and not being buoyant.

Is it a new coolant tank or is it a replacement sensor that fits in the tank?

A search says PCJ500030 - is the sensor and LR020367 is the bottle.

Does the bottle come with the sensor and can I just swap the sensor in the original bottle?

Cheers

Jim
   
Post #202873415th Feb 2019 10:57 am
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dgardel
 


Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025

Italy 2014 Discovery 4 3.0 SDV6 XXV LE Auto Santorini BlackDiscovery 4

But, is the coolant level correct?
 Discovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition

IID Pro MV License

 
 
Post #202873515th Feb 2019 11:06 am
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sarumlight
 


Member Since: 06 Nov 2008
Location: Off the Plain
Posts: 1589

United Kingdom 2008 Discovery 3 TDV6 HSE Auto Tonga GreenDiscovery 3

Make sure the coolant level isn’t actually dropping ( You can get a leak from an EGR cooler or from the plastic water manifold on top of the engine ). If there’s definitely no leak then just replace the whole bottle which has a new sensor inside.
  
Post #202873615th Feb 2019 11:11 am
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jamez79
 


Member Since: 03 Sep 2018
Location: Staffordshire
Posts: 565

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Indus SilverDiscovery 4

Yes the level is correct. Not tried revving it on the drive, will try that now.

Thanks
   
Post #202873815th Feb 2019 11:16 am
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jamez79
 


Member Since: 03 Sep 2018
Location: Staffordshire
Posts: 565

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Indus SilverDiscovery 4

The level is on the upper line of the "cold fill range". Revving it on the driveway, I can see the level drop by about a cm or 2 and when I let off the revs the level returns to normal.

I couldn't get the light to come on whilst doing that on the drive.

Would that suggest it's just the float then?

Cheers

Jim
   
Post #202874315th Feb 2019 11:49 am
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Discoveringcomfort
 


Member Since: 16 Sep 2015
Location: Berkshire
Posts: 637

England 2005 Discovery 3 4.4 V8 HSE Auto Zambezi SilverDiscovery 3

sarumlight wrote:
Make sure the coolant level isn’t actually dropping ( You can get a leak from an EGR cooler or from the plastic water manifold on top of the engine ). If there’s definitely no leak then just replace the whole bottle which has a new sensor inside.


Thread hijack.

Does the V8 EGR suffer from leaks as mine is loosing water, pump changed (definitely one leak) and thermostat housing (not leaking). If not EGR then head gasket as chemical test turns slightly green.
 Series 1 V8
Series 2 Hibrid V8
Discovery 3 HSE V8 
 
Post #202930217th Feb 2019 7:51 am
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jamez79
 


Member Since: 03 Sep 2018
Location: Staffordshire
Posts: 565

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Indus SilverDiscovery 4
Update: Coolant flow question

Hi,

I changed the coolant reservoir and it sorted the warning light issue for a good while. The other day however, the warning came on again. I stopped and checked the level and it was the same as when I changed the reservoir.

I figured I may have air trapped (changed the bottle using clamps on the pipes) and its worked its way round causing an air lock?

Tried the bleed procedure as shown in Topix and when I rev the engine to 3000rpm, I can see the coolant level drop quite a bit, but not out of the bottom of the bottle or anything.

I topped it to 30mm over the line as it said and now it's sat at 30mm over the max fill. Is this normal? I suggest probably not.

Threads on here say to look for a steady flow of coolant, but I don't seem to have one at all?

The engine doesn't overheat, or spike/fall on the temp guage and other than that low coolant warning, seems to be running fine.

I've undone both bleed valves on the bottle and top of the engine and coolant comes out, not air.

Any ideas what to check please?

Thanks
   
Post #207823724th Aug 2019 2:23 pm
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jamez79
 


Member Since: 03 Sep 2018
Location: Staffordshire
Posts: 565

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Indus SilverDiscovery 4

Cancel my last. I was having a blonde moment (other hair colours are available).

I was removing the bleed screws whilst the engine was running and it didn't seem to do anything.

Tried it with the engine cold and air came out and the coolant in the expansion tank settled.

Just followed the Topix instructions again and its now mid level with a steady flow of coolant.

I'll let it cool and check/top up if needed. Thumbs Up
   
Post #207824924th Aug 2019 4:42 pm
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