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Old 03-24-2010, 10:31 PM   #1
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Radiator Hose Leak

I am starting to leak small amounts of coolant out of the under side of this hose:

It has leaked about 1/4 liter of fluid over 4 months, so I am not overly concerned about it, but I would like to fix it none the less.

1. Has anyone replaced and or reseated this hose?

2. I would also like to do a complete flush. Any coolants you guys recommend? Any cool flush out techniques?

Thank you for any intelligent input!
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Old 03-24-2010, 10:41 PM   #2
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Coolant Flush Procedure

Only use OEM BMW coolant with 50/50 distilled water
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Old 03-25-2010, 11:08 AM   #3
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Looks to me to be the o ring leaking on the temperature sensor.
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Old 03-25-2010, 11:16 AM   #4
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Ditto on sensor o-ring.

I just asked about getting just the 0-ring and haven't heard...though someone just said today, getting just that was possible. Otherwise, new sensor comes with 0-ring.

One guy, Nathan, used a black 0-ring from an ass't of rings, so wouldn't have a particular size to share...but maybe someone will soon!

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Old 03-25-2010, 11:24 AM   #5
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+1,000,000 Dude, the O-ring in the temperature sensor has gone Tango Uniform. Just go to the Stealership get a new O-ring raise the hood, grab the sensor by the sides, push the sides and pull the sensor straight up, pull the old O-ring off replace it with the new one, push the sensor back into place and drive on... I replaced this in the Stealership parking lot, piece of cake. Just my two and a half cents worth...
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Old 03-26-2010, 03:33 PM   #6
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had the same problem a couple months ago, losing about the same amount of fluid. I didnt do a DIY but had a indie shop repair it for me. I bought the parts from pelican and had them replaced and had them do a coolant flush. The only thing i wish i did was replace the coolant expansion tank aslo. So if your going to replace the lower radiator hose, might as well do the upper hose and coolant expansion tank. And the reason for the leak was the O-ring for the sensor.
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Old 03-26-2010, 07:16 PM   #7
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Mine leaked at that spot - was the radiator warped to hell and starting to leak in that corner... worth checking also
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Old 03-27-2010, 01:36 AM   #8
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Thank you guys for the info!

Isnt that sensor 0-ring under pressure? How can you do it in a parking lot on the fly when its under pressure? I would imagine I would need to replace it when the radiator is drained, right?
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