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X3 E83 (2004 - 2010)
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  #1  
Old 10-29-2013, 04:58 AM
scott1967 scott1967 is offline
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Mein Auto: 2005 BMW X3 3.0l
NEED HELP! 05 X3 coolant leak

First time poster here. I have used this site several other times for information.

I have a 05 X3 3.0l and it is leaking coolant pretty bad. I just replaced the expansion tank because it was leaking. But, after I got that on the oil cooler under the expansion tank is leaking. Don't know if I screwed it up getting the expansion tank out.

Question is do you think it might just be the o-ring leaking or will I have to replace the whole housing? Can that housing be replaced separate of the radiator?

Please help this is my daughter's car and I have to get this fixed ASAP!

Thanks in advance.

Scott
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  #2  
Old 10-29-2013, 07:18 AM
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mlukas161 mlukas161 is online now
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Is it an automatic transmission? There is an auto transmission thermostat that the expansion tank sit it. Quite often that part will break and need to be replaced. See attached photo.

Other option may be that the expansion tank is not seated correctly. Did you hear it click into place? How big of a leak are we dealing with?
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  #3  
Old 10-29-2013, 07:57 AM
scott1967 scott1967 is offline
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Quote:
Originally Posted by mlukas161 View Post
Is it an automatic transmission? There is an auto transmission thermostat that the expansion tank sit it. Quite often that part will break and need to be replaced. See attached photo.

Other option may be that the expansion tank is not seated correctly. Did you hear it click into place? How big of a leak are we dealing with?
Thanks for your response. Yes it is an AT. And its a pretty substantial leak. Steady stream of hot coolant. I don't remember hearing a click but I did pullup on it a little and it wouldn't come up so Ifigured it was locked on. It looks as if the coolant is coming from between the radiator and the trans thermostat housing. CCan'ttell if its from the heat eexchanger o-ring.
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  #4  
Old 10-29-2013, 08:23 AM
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mlukas161 mlukas161 is online now
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Probably not what you want to hear, but I think you have to remove the expansion tank again to see whats going on. Did you replace the trans thermostat with a new one? I broke my old one when I replaced my expansion tank. My guess is that yours is also broken and not permitting the expansion tank to seat properly... ( make sure the car is cooled down of course ) Good luck.
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  #5  
Old 10-29-2013, 09:04 AM
Supercourse Supercourse is online now
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I think a rule of thumb is that with A/T models you always put in a new A/T cooler thermostat when replacing the expansion tank.

Even if you are able to pull off the old expansion tank very carefully without breaking the thermostat it is past its best anyway and will be a weak link.

Unfortunately it costs nearly as much as the tank itself, but not worth the risk.

Other than that, any technique you used to pry the old tank off its seat that might have damaged the connection to the transmission cooler?
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  #6  
Old 10-31-2013, 10:19 PM
silentbob silentbob is offline
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When I changed my expansion tank, I broke the auto transmission thingy as well. If you leave it broken and in there, your expansion tank will not seat properly!

BUT, I have good news for you. Drain the expansion tank, and just the expansion tank, pull it out, and check the condition of your auto transmission doohickey. If it is broken and you absolutely HAVE to drive the car, pull the remaining pieces of it out. It will enable your expansion tank to seat properly and it wont really hurt anything to drive without it for a few days. I drove without mine for 2 weeks.

Then, when the replacement comes, just pull the expansion tank again and install it.

The good news is that its really easy. You dont have to drain the radiator, you dont have to drain the block, just the expansion tank, so it's not that much coolant, and bleeding it is a breeze.
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  #7  
Old 11-01-2013, 07:27 AM
cagui1223 cagui1223 is offline
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Any luck with this? Pictures would really help! If the expansion tank and the A/T thermostat are fine then it might be the expansion tank mounting plate that needs replacement.. Refer to the following link for several pictures of it:
http://www.ecstuning.com/BMW-E83-X3-...oling/ES38045/

Btw,
if you need a transmission thermostat be sure to check out www.bavauto.com
The Genuine BMW one runs about $94, but they also have other brand ones as low as $39.00.
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  #8  
Old 11-01-2013, 07:40 AM
scott1967 scott1967 is offline
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I pulled it apart and found that the trans thermostat was broken. I picked one up from BMW and I installed it yesterday. Now it is overheating and Ihave no heat. Can't decide if its a bad water pump or thermostat so I have ordered both to be sure.
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  #9  
Old 11-01-2013, 08:27 AM
cagui1223 cagui1223 is offline
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Uh.. This all started as a coolant leak though right? When you replaced the thermostat did you:
make sure the coolant fluid was filled up between min & max levels? and did you bleed the system, making sure any air trapped inside has been removed?
When you replaced the thermostat did you exert enough downward force on the piece to make sure it sat properly in place?
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  #10  
Old 11-01-2013, 08:36 AM
Supercourse Supercourse is online now
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Quote:
Originally Posted by cagui1223 View Post
The Genuine BMW one runs about $94, but they also have other brand ones as low as $39.00.
You can get a genuine BMW one here for less than aftermarket ones:

http://www.ebay.com/itm/Genuine-BMW-...50957253053%26

It does have the small BMW logo embossed in the plastic.
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  #11  
Old 11-01-2013, 08:41 AM
silentbob silentbob is offline
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Quote:
Originally Posted by scott1967 View Post
I pulled it apart and found that the trans thermostat was broken. I picked one up from BMW and I installed it yesterday. Now it is overheating and Ihave no heat. Can't decide if its a bad water pump or thermostat so I have ordered both to be sure.
Did you do a proper bleed? Car off, heater on, 91 degrees, central air vent turned fully to red, fan on full blast?
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  #12  
Old 11-01-2013, 12:49 PM
cagui1223 cagui1223 is offline
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Quote:
Originally Posted by silentbob View Post
Did you do a proper bleed? Car off, heater on, 91 degrees, central air vent turned fully to red, fan on full blast?
Thats exactly what I meant, well said silentbob
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