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Chrisblob

2006 540i N62 big coolant hose detached

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Hi all, I was driving along the Southern Motorway in Chch last night when iDrive warned me the car was low on coolant, and a guy next to me yelled out that I was losing fluid, so I pulled over and looked back to see a big stream of coolant along the road behind me. I got the car towed home, then had a look under the hood - the big main coolant hose from the water pump to the top passenger side of the radiator had detached at the radiator end - so I found the source of the leak easily! 🤪

Its an old car (nearly 150,000km), so I'm hoping there is nothing other than age that has contributed to the hose detaching. The hose itself doesn't look split or cracked, still feels pliable, it just looks like it's popped off. I was cruising gently at 100 kmh when it happened, and prior to that was slowly working through typical Chch rush hour traffic - no thrashing the car, just gentle driving.

Has anyone else with the N62B40, B44, or B48, had that hose detach? If yes were there any things to watch for when re-attaching and refilling the coolant? Did you replace the hose? I might replace the coolant reservoir as the red level indicator has broken. Any advice is welcome, before I start doing a DIY fix. 👍

Cheers, Chris W, Chch

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