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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8227
  
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I've had a low coolant warning flash up 3 or 4 times in the last few days usually within the first 3 miles of a journey but today it did it after approx 10 miles, water level and temp gauge are good, strange thing is my daughter has exactly the same fault in her D4, it's only happened during the hot weather.
Any advice greatly appreciated. It can when others can't,
It will when others won't,
It goes where others don't.
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 29th Jul 2021 7:34 pm |
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kajtzu
Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6754
  
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If coolant level is ok when cold then the most likely culprit is the sensor on the bottom of the expansion tank. You need to swap in a new tank. 
And yes it is very common. 
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| 29th Jul 2021 7:53 pm |
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darek
Member Since: 11 Oct 2014
Location: Essex
Posts: 41
 
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I had the same issue couple weeks ago. Problem is the floating element inside an expansion bottle. After time it loosing ability to float. New bottle fixed the problem. MY14 D4 3.0 SDV6 HSE in Loire Blue
MY05 D3 2.7 TDV6 SE Java Black & Alpaca interior 235k miles on clock  - gone 😔
black 18" wheels, audio upgraded to Logic7, iid tool
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| 29th Jul 2021 8:53 pm |
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Scott #55
Member Since: 15 Apr 2015
Location: UK
Posts: 1683
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+1 for sensor in the bottle.
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| 30th Jul 2021 8:01 pm |
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Patman
Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314
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i get same display and although water ironically was topped up to what looked like overflowing it comes up more now than before so looks like new bottle hope its an easy job? Patman
Derek the Discovery keeper and owner
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| 30th Jul 2021 8:42 pm |
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kajtzu
Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6754
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It’s not easy as changing cup holders on the D3 but it is not a difficult job on any scale 
Plenty of YouTube videos around, I think.
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| 30th Jul 2021 8:48 pm |
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Patman
Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314
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great stuff
have just found you can replace just sensor as oppossed to entire bottle who knows might strip it open see if any leaves or detritus stuck in there first Patman
Derek the Discovery keeper and owner
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| 30th Jul 2021 9:18 pm |
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darek
Member Since: 11 Oct 2014
Location: Essex
Posts: 41
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Parman,
Changing sensor won't give you any benefit. It is very rare to be faulty sensor. Usually the problem is the floating ring inside the bottle which work together with sensor. Unfortunately this element isn't replaceable. New bottle is the only way, I'm afraid.
However, you might be lucky with faulty sensor only MY14 D4 3.0 SDV6 HSE in Loire Blue
MY05 D3 2.7 TDV6 SE Java Black & Alpaca interior 235k miles on clock - gone 😔
black 18" wheels, audio upgraded to Logic7, iid tool
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| 30th Jul 2021 10:03 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8227
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Solved my problem, water was slightly low when cold  checked it previously when hottish!
Topped up with neat antifreeze which should raise the specific gravity slightly. It can when others can't,
It will when others won't,
It goes where others don't.
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| 2nd Aug 2021 1:06 pm |
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kajtzu
Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6754
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Glad you figured out the problem.
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| 2nd Aug 2021 1:39 pm |
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