Member Since: 19 Jul 2016
Location: Ashbourne
Posts: 698
Low coolant Warning
Morning All,
My low coolant warning light keeps coming on, especially when I floor it for a few seconds (overtaking/ crawler lanes etc) then is stays on until I turn off the car and restart, even then, sometimes it remains on.
The level seems fine, a few mm over the max line. the only work it's had done recently was the big belt service in March, Is there a need to touch/ drain the cooling system when replacing the belts?
I've found lots in instances of this on a D3 float becoming saturated but nothing conclusive on a D4, do D4's suffer the same issue?
Any help appreciated.
It is still under used approved warranty (for another month) so I'm going to add it to the list when its at the dealer in a few weeks.Disco4 MY16 SDV6 Landmark Black
Disco4 MY12 SDV6 XS Orkney Grey (Gone)
Defender 90 200tdi Completely rebuilt.
4th Jun 2018 10:11 am
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
may be the sensor.....Discovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition IID Pro MV License
4th Jun 2018 3:09 pm
Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1067
Check the wiring also. The connector may be loose or not seated properly.
The technical approach is to give it a 'waggle' "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
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)
4th Jun 2018 3:12 pm
DiscoJeffster
Member Since: 27 Feb 2016
Location: Perth
Posts: 204
I bought a new generic bottle and found the included new sensor problematic causing triggers of low coolant. I replaced the sensor with my original and it resolved it. Based on this, see if you can find a new sensor to try
5th Jun 2018 4:24 am
mikethomp
Member Since: 03 Feb 2018
Location: Peak District
Posts: 11
Hi Browny90 - I'm interested to know if you resolved the problem? I've got a MY12 D4 and don't haver a low coolant level, but I'm seeing the same low coolant warning after accelerating up steep hills, after which it quickly disappears.
Mike
10th Jun 2018 3:10 pm
Browny90
Member Since: 19 Jul 2016
Location: Ashbourne
Posts: 698
Maybe it’s just a Peak District thing 😂
It’s going into Hunters Derby on 20th July for a warranty mod up before it runs out that week..
I’m assuming it’s going to be the sensor or wiring, the important thing is that there’s coolant in there! Mine isn’t just on hills, just seems to be whenever you kick it down and pull off faster than normal it comes on. I’m going to film it if I can in the next week or two so I can show the dealship I case the car has a change of heart on the day..Disco4 MY16 SDV6 Landmark Black
Disco4 MY12 SDV6 XS Orkney Grey (Gone)
Defender 90 200tdi Completely rebuilt.
10th Jun 2018 3:19 pm
sarumlight
Member Since: 06 Nov 2008
Location: Off the Plain
Posts: 1592
When the float went on my D3 it only triggered the low coolant message when the engine revs got above a certain point. I guess it had enough buoyancy when the water wasn’t moving about too much.
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