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Old 10-23-2018, 07:25 AM
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Engine Coolant leak. Header tank or sensor.

Folks

My 4.8 is; is slowly leaking coolant at the header tank / coolant level sensor? I know not which one?

I attempted buy a new sensor O-Ring from BMW, who tell me I have to buy a new sensor? Which I have done.

Now I find the new sensor has no O-Ring? And BMW now say that the O-Ring is built into/part of the header tank?

They also now tell me (helpful) that a new header tank comes complete with a sensor & O-Ring?

Any clues here?

* Should I fit the new sensor to the old tank?

* Should I buy a new tank with sensor?

The price difference is about £100 UK

Anybody had the tank leak and replaced it?

Or just replaced the sensor?

Bruce


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Old 10-23-2018, 10:03 AM
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The coolant level sensor works by magnetism and is not in contact with the coolant so no seal is needed.
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Old 10-23-2018, 10:54 AM
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Now that’s interesting. When I removed my old sensor, coolant came out the hole. The original sensor looks to have a copper fork that goes inside the tank. The new one is covered completely in blue plastic with no metal visible.

I have cleaned the outside of the tank, to make leak spotting easier. Fitted the new sensor and will now wait & see.

Thank you.

Bruce


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