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DIY: Do It Yourself
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Old 02-16-2010, 11:22 PM   #1
BMWfever
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How to fix this antifreeze leak?

My 330Ci has been stuck in garage since I bought it earlier in the month. (snowbound).

This evening I noticed a antifreeze leak on the floor . . . It appears to be coming from a temp sensor? at lower radiator hose connection, passenger side . . (photo attached). . .
-What is involved in fixing this? a o-ring maybe?
- How do I get the sensor out, looks like some kind of spring-clip?

I am brand new to BMWs and have a lot to learn.

Thanks,
-Ron

Edit with info I learned later, (in this thread and other places). ---------------------------

- this apparently is a common issue (leaking at the temp sensor)
- it was an o-ring, replacement = BMW # 13.62.1.743.299
- the sensor is easy to remove, but you will have to deal with the coolant
- I chose to drain the radiator, but if I had to do again, I think I would try to just pull the sensor and deal with any that leaks out.

Related links:
http://www.bimmerfest.com/forums/sho...ighlight=oring
http://www.bimmerfest.com/forums/sho...d.php?t=409007

To remove the sensor:
1) depress the metal clip on electrical connection
2) pull electrical connection straight up
3) depress two tabs on sensor and pull straight up




If you lose a lot of coolant and any point, be sure to crack open the vent when refilling.



Thanks to everyone for your help.
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Last edited by BMWfever; 03-04-2010 at 02:52 PM. Reason: Update with findings.
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Old 02-16-2010, 11:29 PM   #2
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unclip the sensor just by pressing the metal clip inward and pull up.... the just squezz the sensor's to taps and pull up!
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Old 02-16-2010, 11:36 PM   #3
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Originally Posted by issacsierra06 View Post
unclip the sensor just by pressing the metal clip inward and pull up.... the just squezz the sensor's to taps and pull up!
Thanks for the quick reply! .

What is most likely the fix? Is there some kind of "o-ring" seal that needs replacing.? Hopefully not that it is common for the housing to crack etc.
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Old 02-17-2010, 06:41 PM   #4
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the o-ring on this part has been known to wear out and cause mysterious leaks. I have this problem and it only effects me in the cold.

Has anyone pulled the sensor out before? does it gush coolant when you remove the sensor?
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Old 02-17-2010, 06:55 PM   #5
Kole
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Yes you will dump half your coolant out pulling this. O-ring gets heat set, leaks. Happens. I think a new one is only $15? Can't remember exactly.

edit: for new sensor, I wish I could find just the o-rings for everything on this car
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Old 02-17-2010, 07:20 PM   #6
charlesberry
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Oh how familiar I just did this. You first need to remove the electical wire from the sensor. There's a metal clip holding the electrical wire to the sensor. Take a screwdriver, and back off the metal clip, you do not fully remove the clip, but back it off about half way. Then pull the wire straight up and off. Move it out of the way. Next, on each side of the sensor is a plastic tab. To remove the leaking sensor, push the 2 plastic tabs towards eachother, or push them together and pull the sensor out of the hose. I had a few drops leak out but not much. Certainly not enough to worry about. Now, there's an O-ring that wears out and can be replaced. It's $1.00 part from the dealer. Replace the O-ring and reinstall.

BMW part number for this o-ring: 13.62.1.743.299

Also, check this out as it relates to your question.

http://www.bimmerfest.com/forums/sho...ighlight=oring
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Old 02-17-2010, 10:34 PM   #7
E46SaloonM
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Get a o ring 2 $
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Old 02-17-2010, 11:45 PM   #8
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Quote:
Originally Posted by Titanium3Series View Post
the o-ring on this part has been known to wear out and cause mysterious leaks. I have this problem and it only effects me in the cold.

Has anyone pulled the sensor out before? does it gush coolant when you remove the sensor?
Good to know I am not the only one, (I guess).

This ended up embarrasingly simple. I did not look from the top down prior to posting this question. As 'issacsierra06' described, the wiring harness is easily disconnected by pressing the metal clip inward. . . . then the sensor can be removed by squeezing the two side tabs and pulling straight up . . (easy to figure out when looking from the top).

I drained the coolant prior to doing this, so I do not know if coolant would gush out. (but I suspect it would). I have to admit though, if I have to do over again, I think it might be easier to pull the sensor, stuff something in its place to keep coolant from gushing out, replace the o-ring, and re-assemble . . . Some coolant will spill out, but it still would be easier than what I did --> drain coolant into bucket, remove sensor, fix o-ring, start pouring coolant back into Reservoir, (only to have it overflow), clean up the mess, and now I am still not done because I will have to start engine to get all the air bubbles out, then continually check the level until convinced it is really full.
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Old 02-17-2010, 11:55 PM   #9
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Embarrassed again . . I did not see all the new posts prior to going to garage. Some good stuff there.

Thanks to everyone for the suggestions. I did not replace the o-ring, but did some magic therapy on it. . . We will see if that works.

Thanks again!!
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Old 02-17-2010, 11:57 PM   #10
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Quote:
Originally Posted by BMWfever View Post
Embarrassed again . . I did not see all the new posts prior to going to garage. Some good stuff there.

Thanks to everyone for the suggestions. I did not replace the o-ring, but did some magic therapy on it. . . We will see if that works.

Thanks again!!
Please tell me you didnt put glue on it
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Old 02-18-2010, 12:24 AM   #11
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Originally Posted by bmwTuner1 View Post
Please tell me you didnt put glue on it
No, not THAT bad!

Softened it up by soaking in transmission fluid. I was not sure it would work on the green ring (viton?), but it appeared to help, definately got rid of the flat spot on outside of ring.

If it leaks again, I will get a true replacement.
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Old 02-18-2010, 11:37 AM   #12
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It cost $26 at your local BMW. I had to do this myself the very day i got this car. Its very easy. Let me know if you need help
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Old 02-18-2010, 11:41 AM   #13
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DUCT TAPE!!!
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Old 02-25-2010, 12:52 AM   #14
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I thought I would summarize with a couple photos. The posts above explain quite a bit, but this photos might help also for anyone searching forum about leaks, or replacing the temp sensor.

I did not know to crack open the vent when I first tried to pour the antifreeze back in. If the vent is not open, there will be a large "air bubble" in the system that is hard to get rid of.
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Old 01-19-2020, 10:09 PM   #15
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Quote:
Originally Posted by BMWfever View Post

Softened it up by soaking in transmission fluid. I was not sure it would work on the green ring (viton?), but it appeared to help, definitely got rid of the flat spot on outside of ring.

If it leaks again, I will get a true replacement.
Almost 10 years later, it did start leaking again. The tranny-fluid soak did the trick for quite a while, but not permanent.

I replaced with new one.
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