Expansion Tank / Hose Coolant leak

nate16 · 11-13-2015, 08:37 AM

Question:

I'm leaking coolant between the bottom fitting of the expansion tank and the hose that clips in there with a c-clip.

Is there an oring in this fitting I could replace?

Does anyone have any experiance with a similar leak? It seems like an oring issue and would rather not have to replace the Tank (100$) and the hose (100$)

Thanks,
Nate

weehe126 · 11-13-2015, 11:10 PM

Probably have to replace the tank as it most likely has a crack.

nate16 · 11-13-2015, 11:23 PM

Yup, tried replacing the oring no luck. Ended up just getting the tank and replacing that. Problem resolved.

perezr10 · 12-06-2015, 08:10 PM

So how much did the tank cost you?

Gamboa989 · 12-06-2015, 08:50 PM

I recently had a small leak coming from the expansion tank. When I took my car to the dealership (still under warranty) they replaced the o-ring, expansion tank, and the hose running to the radiator.

I guess the expansion tanks are known to crack, according to my SA.

nate16 · 12-06-2015, 08:51 PM

Quote:

Originally Posted by perezr10

So how much did the tank cost you?

tank cost me I think 126$ at bmw parts dept

Welcome to NBA Jam · 12-07-2015, 11:29 AM

Quote:

Originally Posted by Gamboa989

I recently had a small leak coming from the expansion tank. When I took my car to the dealership (still under warranty) they replaced the o-ring, expansion tank, and the hose running to the radiator.

I guess the expansion tanks are known to crack, according to my SA.

BMWs from 1999+ (dunno about the F30) have had ET cracking problems. It became prominent enough that Bosch released a revised part number for the E46 at some point in the future. I wonder if the E9X is the same way.

Edit: Yep, looks like they did. It was revised in 2013. The new part number is 17137640514.

Jdub679 · 12-07-2015, 01:45 PM

Also had this issue. Replaced under warranty.

trixdout · 12-08-2015, 02:07 PM

Quote:

Originally Posted by Welcome to NBA Jam

BMWs from 1999+ (dunno about the F30) have had ET cracking problems. It became prominent enough that Bosch released a revised part number for the E46 at some point in the future. I wonder if the E9X is the same way.

Edit: Yep, looks like they did. It was revised in 2013. The new part number is 17137640514.

Hopefully with this new revised part, one I recently purchased to fix my leaking tank, I won't have to replace it in less than another 60k miles.

TheRealMccoy24 · 03-30-2016, 11:40 AM

Quote:

Originally Posted by nate16

Yup, tried replacing the oring no luck. Ended up just getting the tank and replacing that. Problem resolved.

You have a DIY you referenced? Going to replace mine tonight. Also did you hookup a battery charger?

JETmn · 03-31-2016, 01:25 PM

My expansion tank was replaced earlier this month also. 87k on my car.

11-13-2015, 08:37 AM	#1
nate16 Banned 172 Rep 327 Posts Drives: 2017 F80 YMB ZCP Join Date: Sep 2015 Location: Peabody, MA iTrader: (1)	Expansion Tank / Hose Coolant leak Question: I'm leaking coolant between the bottom fitting of the expansion tank and the hose that clips in there with a c-clip. Is there an oring in this fitting I could replace? Does anyone have any experiance with a similar leak? It seems like an oring issue and would rather not have to replace the Tank (100$) and the hose (100$) Thanks, Nate
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11-13-2015, 11:10 PM	#2
weehe126 Brigadier General 1189 Rep 3,228 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Probably have to replace the tank as it most likely has a crack.
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11-13-2015, 11:23 PM	#3
nate16 Banned 172 Rep 327 Posts Drives: 2017 F80 YMB ZCP Join Date: Sep 2015 Location: Peabody, MA iTrader: (1)	Yup, tried replacing the oring no luck. Ended up just getting the tank and replacing that. Problem resolved.
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12-06-2015, 08:10 PM	#4
perezr10 Lieutenant 143 Rep 433 Posts Drives: 2013 335i Sedan Join Date: Jan 2015 Location: San Antonio, TX iTrader: (1)	So how much did the tank cost you?
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12-06-2015, 08:50 PM	#5
Gamboa989 Private First Class 9 Rep 106 Posts Drives: 2012 335i E92 Join Date: Nov 2012 Location: Cape Coral, Fl iTrader: (0) Garage List 2009 Bmw 328i [0.00]	I recently had a small leak coming from the expansion tank. When I took my car to the dealership (still under warranty) they replaced the o-ring, expansion tank, and the hose running to the radiator. I guess the expansion tanks are known to crack, according to my SA.
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12-07-2015, 01:45 PM	#8
Jdub679 Captain 88 Rep 644 Posts Drives: 2011 BMW 335i coupe M Sport Join Date: Jan 2011 Location: Irvine, CA iTrader: (1)	Also had this issue. Replaced under warranty.
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03-31-2016, 01:25 PM	#11
JETmn Lieutenant Colonel 247 Rep 1,595 Posts Drives: 2011 335i xDrive Msport Join Date: Apr 2013 Location: Orlando iTrader: (0) Garage List 2011 335Xi [0.00]	My expansion tank was replaced earlier this month also. 87k on my car.
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