 | Home > Faults & Fixes (L663) > low coolant warning light |
 
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| Telemarkskier Member Since: 20 Jul 2020 Location: Wiltshire Posts: 115  
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So despite agreeing to replace the whole header tank unit, having waited months, the dealership only ordered a replacement sensor and pressure cap. Low and behold the same fault is still present. The vehicle has been with the dealership for 2 days and now I have to wait for the header tanks which of course is on back order.
 2020 Defender 110 SE 240D: Fuji White.
2011 Freelander 2 SD4 HSE 2007 Freelander2 HSE (man) |
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19th Jan 2024 5:37pm |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2240
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Can't see it being a fault with the header tank, in what way could it be faulty? lt's just a plastic tank. Unless JLR have since modified the part to reduce the chances of a false coolant warning.
l hope they manage to repair it though. |
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20th Jan 2024 1:41pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19574
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Top it up just a little more, perhaps 5 / 10mm above the level but no more than that.
It’s likely the fluid moving around triggering the switch, you can get similar occur with brake fluid headers. Triggering the warning light to come on if you go downhill as an example due to fluid movement, a little top up will often cure it even if it seems practically on max level mark. Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧 |
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20th Jan 2024 2:37pm |
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| Telemarkskier Member Since: 20 Jul 2020 Location: Wiltshire Posts: 115
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Already 10ml above max. Garage tried that solution by the looks of it. 2020 Defender 110 SE 240D: Fuji White.
2011 Freelander 2 SD4 HSE 2007 Freelander2 HSE (man) |
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29th Jan 2024 5:27pm |
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| Jascon Member Since: 02 Jun 2021 Location: QLD Posts: 9 
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Hi All,
Just been reading the post and my P400 seems to have the exact issue. It’s been in for pressure tests after loosing coolant and found to have a faulty hose. Since then, the hose was replaced and more pressure checks and came back all good. However the coolant lights and warning keeping coming back on, once or twice a day, just as I seem to let go uphill…. I think. Checked the coolant and all seems good. Just came back from the dealer after they replaced the sensor and on the way home, the light and warning came on again. No idea what the problem can be, any ideas. The dealer said possible air bubble but not sure what action I should take next. |
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21st Feb 2024 10:21am |
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| Telemarkskier Member Since: 20 Jul 2020 Location: Wiltshire Posts: 115
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The combined header tank + sensor is on back order in the UK but the dealership has been notified that they have an allocation so booked in at the end of March......no loan cars until July!!!!! Borrowing a demonstrator instead.
Since replacing the sensor as the first attempt at repair the frequency of warnings has shot up. I can't see it being an air bubble as that should have cleared. It would be interesting to have a video of what is going on with the levels of fluid in the header tank while the car is driven. The warnings appear 20 seconds or so whilst cruising after an fast overtake or acceleration. Doesn't show up when going over rough terrain. 2020 Defender 110 SE 240D: Fuji White. 2011 Freelander 2 SD4 HSE 2007 Freelander2 HSE (man) |
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21st Feb 2024 11:08am |
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| Jascon Member Since: 02 Jun 2021 Location: QLD Posts: 9
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Could it be the pressure cap?
I’ve just cleaned mine, and no warnings today. But that could be purely coincidence |
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22nd Feb 2024 10:31am |
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| Telemarkskier Member Since: 20 Jul 2020 Location: Wiltshire Posts: 115
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I doubt it, they replaced the pressure cap when replacing the sensor. 2020 Defender 110 SE 240D: Fuji White.
2011 Freelander 2 SD4 HSE 2007 Freelander2 HSE (man) |
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22nd Feb 2024 11:05am |
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| NigelM Member Since: 20 Nov 2014 Location: South Posts: 114
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Coolant warning light been coming on at start up for the past week. 110 D300. Checked fluid levels and it's sitting on the Max line. Called Hendy in Salisbury who have booked it in for mid March but wanted to get it looked at faster than that so they called LR Assist for me who called me back within 5 minutes and will be here inside 2 hours. Quite impressed with that level of service.
I suspect it's a dodgy sensor and not a major issue, but hopefully they will confirm and put my mind at rest. I've got about 2000 miles to do between now and mid March and would worry if the warning light was on at every start up. Will let you know what happens. |
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22nd Feb 2024 12:34pm |
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| NigelM Member Since: 20 Nov 2014 Location: South Posts: 114
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LR Assist have been. Plugged in. No stored faults in the system and all modules reporting green and up to date. He took out the coolant tank, checked the connection which was fine and concluded it was a coolant sensor issue. Now booked in to have the sensor replaced at the dealer. 2001 110 TD5 (sold)
1999 90 TD5 (sold) Various FFRR & RRS (sold) 110 D300 X-Dynamic HSE (current) |
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22nd Feb 2024 2:27pm |
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| Telemarkskier Member Since: 20 Jul 2020 Location: Wiltshire Posts: 115
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Good luck, we share the same dealership. 2020 Defender 110 SE 240D: Fuji White.
2011 Freelander 2 SD4 HSE 2007 Freelander2 HSE (man) |
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22nd Feb 2024 2:48pm |
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| NigelM Member Since: 20 Nov 2014 Location: South Posts: 114
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The plot thickens a little...
Did 400 miles this weekend and the warning gradually came on more often to the point that by the end it was permanently on. I thought I probably had a leak. Checked the fluid when I got home and still on the Max line. However, checked it again this morning when the engine was cold and it's just above the Min line. Popped into the dealer to get some fluid and spoke to the guys in parts. They told be the level should only be checked when the engine was cold and then topped up to the Max line. I think I have always checked it when warm and found it to be on Max. So tomorrow morning when it's all cold again I will top it to the Max line. I've got 1000 miles to do this week which will be a good test to see if the warning light comes on again and whether it has lost any fluid after 1000 miles from a known datum as the starting point. At the moment I'm not sure whether I have a dodgy sensor or whether I have a leak or both. 2001 110 TD5 (sold) 1999 90 TD5 (sold) Various FFRR & RRS (sold) 110 D300 X-Dynamic HSE (current) |
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26th Feb 2024 3:41pm |
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| Telemarkskier Member Since: 20 Jul 2020 Location: Wiltshire Posts: 115
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The level of coolant in my vehicle stays at the same level hot or cold. 2020 Defender 110 SE 240D: Fuji White.
2011 Freelander 2 SD4 HSE 2007 Freelander2 HSE (man) |
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1st Mar 2024 5:40pm |
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| Telemarkskier Member Since: 20 Jul 2020 Location: Wiltshire Posts: 115
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 Click image to enlarge Problem solved with new header tank. Thank goodness it was done under warranty. They also did a couple of recall wired updates as well. 2020 Defender 110 SE 240D: Fuji White. 2011 Freelander 2 SD4 HSE 2007 Freelander2 HSE (man) |
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29th Mar 2024 8:48am |
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