Coolant Header Tank

ChrisMidWales · Aug 6, 2024

I am loosing small amounts of coolant, I gather this is relatively normal. I may have lost something like 3-4 litres in 6 months.
Where should I be looking for issues as I don’t see anything leaking?
The header tank has many small cracks around the cap, is this an issue that means I need to replace it?

Andy Warren · Aug 6, 2024

Hi, yes I would replace that, along with the cap, if it's got those small cracks. If it's a TD4 then it shouldn't really lose any coolant, I know mine hasn't & it's close to 180,000 now, apart from when the radiator went & the EGR pipe got a pin hole in it,see pic

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Arctic2 · Aug 7, 2024

ChrisMidWales said:
I am loosing small amounts of coolant, I gather this is relatively normal. I may have lost something like 3-4 litres in 6 months.
Where should I be looking for issues as I don’t see anything leaking?
The header tank has many small cracks around the cap, is this an issue that means I need to replace it?

We are presuming it's a FL1 TD4 yes, if so do as above and replace the tank with new cap, other place it can lose coolant is the Y on the head the seal can leak because the part goes brittle.

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Sometimes it is only the seal.

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Al coolant hoses must be checked

Freddie17 · Aug 7, 2024

ChrisMidWales said:
I am loosing small amounts of coolant, I gather this is relatively normal. I may have lost something like 3-4 litres in 6 months.
Where should I be looking for issues as I don’t see anything leaking?
The header tank has many small cracks around the cap, is this an issue that means I need to replace it?

Shouldn’t be using that amount - it’s definitely going somewhere.
Check everything as suggested above for leaks.

Of course, the other possibility is a split in the head gasket, but that would be rare. Check the easy stuff first.

kernowsvenski · Aug 7, 2024

The pipe that goes into the back of the back of the thermostat housing can be a culprit too. There is a small o-ring that can fail. It's pence to buy but a right pain to change

Coolant Header Tank

ChrisMidWales

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