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Discussion Starter · #1 ·
Had this come up on my way in this morning, was on for maybe a couple of minutes and then went off. Bit worried but not sure if it is a genuine warning as I have heard this sometimes appears for no apparent reason.
Assuming I need to fill up, what is the best mix to use?
 

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Just make sure it’s the same colour as what’s already in there and a 50/50 mix.
 

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Had this come up on my way in this morning, was on for maybe a couple of minutes and then went off. Bit worried but not sure if it is a genuine warning as I have heard this sometimes appears for no apparent reason.
Assuming I need to fill up, what is the best mix to use?
You don't say if the Coolant Level had indeed dropped ? I have always found the X350 very sensitive to levels in the Bottle
 

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My experience is that if it tells you the coolant is low, it is low. However when the warning comes up for the first time, it's not usually all that low. In my case I had a small leak that needed sorting out, so I took the car to a specialist who kept the car until the parts arrived, as the small leak was about to become a very large leak. The moral of this tale is that it is best not to ignore a low coolant warning.

Common leak point is the nipple for the small hose going into the header tank. This starts to crack and the crack eventually goes all the way round and the hose then drops off. However before then the low coolant warning alerts you so you can avoid disaster. In my case I had this leak, but also a much more serious one on the water rail behind the radiator, (fitted on the 3 litre V6 petrols, not the V8). So it was a bit expensive as I needed both header tank and water rail parts.
 

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Discussion Starter · #6 ·
From what I could see there is a leak as there was yellowy/brown liquid around the tank. Top the top off and could see none in the tank ( assuming it is the plastic tank by the radiator grill).

So I think a call to the AA is in order.
 

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I have a water leak I just cannot trace, have replaced the header tank and one of the heater pipes but still need to top up every month, but in the last week the ‘low coolant’ warning has come on whilst driving and it hasn’t been low at all, I think it’s a failing level sensor. There is some dried coolant residue on top of plastic header tank but that’s from when I fitted it and was bleeding the system, just bought a new radiator and gonna fit this as soon as I have the time to do it, I also need to replace the air con condenser rad too so I might do both at the same time, air con refrigerant is low any way so not much will leak out when changing it.
 

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Discussion Starter · #8 ·
The plastic pipe on the header tank that the hose attaches too has snapped. AA managed to effect a temporary reapir by reattaching to the remains.

Ultimately, need a replacement header tank.
So anyone knows how much and how easy they are to fit?
 

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Discussion Starter · #13 ·
My experience is that if it tells you the coolant is low, it is low. However when the warning comes up for the first time, it's not usually all that low. In my case I had a small leak that needed sorting out, so I took the car to a specialist who kept the car until the parts arrived, as the small leak was about to become a very large leak. The moral of this tale is that it is best not to ignore a low coolant warning.

Common leak point is the nipple for the small hose going into the header tank. This starts to crack and the crack eventually goes all the way round and the hose then drops off. However before then the low coolant warning alerts you so you can avoid disaster. In my case I had this leak, but also a much more serious one on the water rail behind the radiator, (fitted on the 3 litre V6 petrols, not the V8). So it was a bit expensive as I needed both header tank and water rail parts.
This looks to be what has happened with mine.
 

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My car seems to have coolant that is very keen to escape. I've replaced the header tank, then the valley pipes and finally through the radiator more recently. Still, at least it's got very fresh coolant.
 

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Discussion Starter · #19 ·
I am hoping do Red. From what I think I have worked out so far, I need to
1. Remove the plastic radiator cover to gain better access, after removing the plastic screws, would it just lift out the way?
2. Disconnect the reattached hose from the broken plastic tube at the top of the header tank.
3. There is a screw holding the header tank in place, remove it and it should lift to gain access to two other connections underneath, first I suspect is another pipe and the other a sensor?
4. Fit the replacement.
 

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Not sure if you need to move the plastic radiator cover, wasn't necessary on the S Type.

The tank doesn't move up much when the bolt is removed, just enough to get a hand under the tank. The bottom pipe has a quick release clip facing to the right. Releasing the pipe will result in a flood of coolant so pack the area with rags.

The electrical connection has a standard release tab.
 
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