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- Bone
- Member Since: 07 Feb 2026
- Location: Sussex
- Posts: 2
Coolant tank replacement
Hi all,
New forum member here. Disco owner for a couple of years with 2017 2.0 HSE (it already had a replacement engine under LR warranty with the previous owner)
I have been getting repeated low coolant level alarms on the dash, but a check of the header tank always shows coolant at the correct level. It went in for it's last Land Rover dealer service a month or so ago with a request for them to investigate. They pressure tested the system, said no leaking and that was the end of their investigation.
My suspicion is that the float in the header tank is not longer very buoyant and is the cause of the issue. I have got a new tank here to install, and was just having an exploratory look at what is going to be involved.
Has anyone done this? Is there a preferred route to removing the old tank. It looks like its either a case or removing the airbox to give clearance, or removing the bumper / headlamp, to use the headlamp opening.
Open to suggestions for the 'simplest' way of tackling this.
Thanks
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- PRH
- Member Since: 15 Feb 2018
- Location: South
- Posts: 88
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Welcome to the forum and thanks for raising the question. I shall be watching this one with interest as I have had the same issue for a couple of years and it still flashes up on the dash…..
https://disco5.co.uk/forum/thread3821.html
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- Bone
- Member Since: 07 Feb 2026
- Location: Sussex
- Posts: 2
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Had a dig into this yesterday.
It was actually simple to remove the airbox, just had to remove the intake pipe (two jubilee clips) and a breather pipe which is a push fit onto the airbox. The airbox simply pulls upwards on the 'engine side' out of a rubber bush and then pulls inwards away from the inner wing where it was held on a couple of locating pegs in rubber bushes and a rubber seal where the intake passes through inner wing.
With the airbox out of the way, there is plenty of access to the coolant tank.
So with the new tank fitted, along with a new sensor, the issue was not resolved (doh!). On a test drive still got an intermittent low coolant level warning on the dash.
However having had a play with the multimeter on the tank and sensor out of the car, it looks like the sensor is normally closed with the float 'floating' and then goes open circuit with the float not floating, which makes sense, as it would 'fail open'.
I am confident the issue is not the coolant level, so the next step is to jumper out the sensor at a the connector, and then see if the intermittent faults still occurs, this would indicate a wiring fault, and the joyous(!) prospect of trying to trace the path of the wires back through the loom to identify where is it breaking.
Anyone got a wiring diagram that shows connectors and or routes for this sensor back the BCM-GWM
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