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-   -   2003 325xi leaking coolant (http://forum.e46fanatics.com/showthread.php?t=956287)

akilism 11-16-2012 07:02 AM

2003 325xi leaking coolant
 
my 325xi just started leaking coolant massively the other night. I'm pretty sure its the expansion tank. I was under the car this morning and couldn't tell for sure though. I pour coolant in and it just pours back out of the bottom of the tank and not in a trickle its just flowing out.

video 1: http://www.youtube.com/watch?v=yvoN_t_tkzw

video 2: http://www.youtube.com/watch?v=NupvXKYGGvc

I'd like to overhaul the cooling system but right now I can't even drive it anywhere so I was hoping to just replace the expansion tank asap if that looks like the culprit.

its all coming from here

http://farm9.staticflickr.com/8206/8...c894fd7b_o.png
http://farm9.staticflickr.com/8062/8...08621b77_o.png

Rickna 11-16-2012 07:11 AM

Might be time for a cooling system overhaul depending on the mileage.

SamDoe1 11-16-2012 10:17 AM

It's either the expansion tank or the radiator. Once you pull the tank out, you should be able to figure out where the leak is.

Probably stating the obvious but do NOT turn the car on in this condition.

akilism 11-16-2012 11:32 AM

it seems like its coming right out of the tank. like its not even flowing into the radiator at all.

STiGLiTZ 11-19-2012 09:16 AM

Quote:

Originally Posted by akilism (Post 14905444)
it seems like its coming right out of the tank. like its not even flowing into the radiator at all.

Possibly a bad thermostat causing the pressure back up, if its not able to close the loop and get back into the radiator.

SamDoe1 11-19-2012 09:43 AM

Quote:

Originally Posted by STiGLiTZ (Post 14911714)
Possibly a bad thermostat causing the pressure back up, if its not able to close the loop and get back into the radiator.

The tstat won't block the flow of fluid if it fails.

Rickna 11-19-2012 09:45 AM

Quote:

Originally Posted by SamDoe1 (Post 14911773)
The tstat won't block the flow of fluid if it fails.

+1 Every bad tstat I've seen was locked in the full open position.

STiGLiTZ 11-19-2012 10:08 AM

good to know, learned something new today

akilism 11-19-2012 12:22 PM

got the expansion tank out on saturday. pretty good crack running down it. automatic transmission thermostat broke taking the tank out. so im just going to overhaul the cooling system this week.

Rickna 11-19-2012 12:34 PM

Quote:

Originally Posted by akilism (Post 14912183)
got the expansion tank out on saturday. pretty good crack running down it. automatic transmission thermostat broke taking the tank out. so im just going to overhaul the cooling system this week.

Good plan.

717bimmerboym3 11-24-2012 09:00 PM

fcpeuro.com has really good prices. Just ordered a overhaul kit from them.

tomoyer 11-25-2012 07:16 AM

Do yourself a favor and order the tank mount as well as the tank. And +1 on the TSTAT, they most often fail in the open position, thus not letting the coolant and engine get to full operating temperature.

io14 11-25-2012 08:56 PM

bimmerzone has very good prices as well for the E46 cooling system overhaul.

Thotfulspot 11-26-2012 07:52 PM

I just had a thermostat fail in the closed position.

tomoyer 11-28-2012 08:16 PM

No one stated that the Tstat CAN NOT or DOESN'T fail in the closed position, just not common with BMWs, BUT it does happen.

Thotfulspot 11-28-2012 08:51 PM

Sorry, I didn't mean it that way. I was just saying they can get stuck in either position. When it gets stuck closed, it heats up really fast.

SamDoe1 11-29-2012 09:21 AM

Even if the tstat fails in the closed position it still won't totally block the flow of coolant, it only will block the flow into the engine block. The rest of the system will still receive coolant flow.

Thotfulspot 11-29-2012 10:33 AM

The temp gauge goes from normal to overheated in a matter of minutes. We just dealt with one on a trip from Chicago. It would stick closed intermently. All of a sudden the temp light would go on and the needle would be pegged. Let it cool down and it would work fine for hours. As time went on it would happen more and more often. When I found an independent he changed it and you could see marks on the thermostat where it had been sticking. It rarely got hot when driving because of the air flow at higher speeds. Sitting at idle it would happen almost every time.

e46alfonso 11-29-2012 10:42 AM

Replace everything and never worry again. I'ts an easy diy.

Thotfulspot 11-29-2012 11:01 AM

It's been replaced. Tank and hoses were replaced before the trip. Just need to replace the water pump.


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