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Expansion Tank Leak

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Expansion Tank Leak

Postby SteUK » Mon, 11 Jul 2011 13:49:53 UTC

Hi Chaps/Chapettes,

Just discovered all the lovely coolant has vanished in the past 2 days from my 318i Touring (year 2000 with 87k on the clock). Reaching underneath seems all the juice is coming from the blue connection...shown in this image:

http://www.oembimmerparts.com/i//X5TNK2.JPG

It's about time for a water pump, thermostat change anyway...so figured do these with a tank change. So, a couple of questions.

1) What is this blue connection...sensor?
2) Is it possible that whatever it is will need to replacing to fix the cause of this leak?
3) I feel confident of carrying out this work myself, and really am keen to get stuck in and advance my mechanics skills, how many hours would this take a pro? How much time would you set aside for the job for someone mechanically minded?

Cheers!
Ste
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Re: Expansion Tank Leak

Postby da2ca » Mon, 11 Jul 2011 18:14:46 UTC

Are you sure that is your expansion tank?
Only asking as I had a 325 on an x (E46) and have an E46 cad 330 and both were the same and nothing like that.
Dave.

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Re: Expansion Tank Leak

Postby SteUK » Tue, 12 Jul 2011 07:57:18 UTC

I am almost sure it is not, but it was the only pic I could find during a 2 min break from work ;-)

Part 11 in your posted diagram.

Though...I put half a litre of distiller water in last night to see if I could find where it was leaking from, just enough to make the plastic level indicator bob up. Got under the car and nothing maybe only happens when the car runs hot for a while? Or maybe the leak is somewhere else? When I took the skid tray off fluid had collected at the back so it is definitely coming from somewhere up front!! ;-p

Another possible aside, when switching the engine off I have noticed an air pressure release a second after. Am sure I have not heard that before!

Any suggestions? Take out the tank to inspect? Replace the lot and see what happens? Top up with a little more water and take for a 10 min run round the block then inspect?

Cheers!
Ste
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Re: Expansion Tank Leak

Postby SteUK » Tue, 12 Jul 2011 18:31:51 UTC

Found it!!!

For those venturing into this sort if thing for the first time...it is a simple matter of getting the engine up to temperature, thus getting the cooling system pressurised. The leak will soon rear it's ugly head! Mine is on the passenger side of the tank...squirting out in a stream after 15mins of engine idle.

Guess what I am doing this weekend?! Last few questions for the wise to help with...

1) Are BMW water pumps worth double the money?
2) Can anyone recommend a half decent cheap(ish) torque wrench?

Cheers
Ste
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Re: Expansion Tank Leak

Postby slim_boy_fat » Tue, 12 Jul 2011 18:54:36 UTC

SteUK wrote:1) Are BMW water pumps worth double the money?


I got mine from www.c3bmw.co.uk - genuine parts at good prices. I'd also do the thermostat while you're in there. :wink:
Never underestimate the power of thrawn.
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Re: Expansion Tank Leak

Postby steve521 » Wed, 13 Jul 2011 13:47:45 UTC

hey there you can find some genuine parts here http://www.autopartswarehouse.com/repla ... ement.html and get it fixed by a good machanic
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