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Expansion tank and hose parts help....

9757 Views 14 Replies 7 Participants Last post by  mlukas161
Hello,

I am wanting to replace my expansion tank and some hoses on my cooling system on my 2004 X3 2.5l

I am not exactly sure what parts i will need besides the tank and hoses (ie. clamps, plugs, sensors, ect.) what can be used still and what do i need to replace?

here are the parts diagrams... any help is truly appreciated I want to do this myself as the dealer charges so much ....

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Can anyone help me out??? I'm trying to buy these parts today...
When i had my mechanic do the expansion tank swap years on my E46 (same engine), I simply bought the tank. If you are buying new hoses that go to/from the tank, you should be good. The old clamps can be used.
On the expansion tank, from what I read, the thermostat for A/T models often breaks when the tank is pulled out.

If you are careful and luck out, it can be re-used, but it's one of those things that can hold the job up if you need one and don't have it on hand.

It controls flow through the A/T cooler which is located nearby. Don't think they wear out, just fragile.

Might be a non-returnable item, so difficult to call.
i had just replaced my thermostat a couple months ago after it had failed. i replaced the expansion tank while i was at it and a couple of the hoses.

Kevin, most of the clamps are reusable. at least i reused all of mine. You should replace your A/T thermostat (Part #11 in the first diagram) since you'll be replacing your expansion tank.
i also recommend you replace your bleeder screw to the brass ones if you haven't already.
On the expansion tank, from what I read, the thermostat for A/T models often breaks when the tank is pulled out.

If you are careful and luck out, it can be re-used, but it's one of those things that can hold the job up if you need one and don't have it on hand.

It controls flow through the A/T cooler which is located nearby. Don't think they wear out, just fragile.

Might be a non-returnable item, so difficult to call.
Thanks for the help the dealer didn't have all the parts in stock so had to order some going to change it all next week.... If anyone has any advice on the steps necessary to complete this job let me know
I would search changing the cooling system in the e46 forum. There are a ton of DIY pages and the m54 engine is exactly the same. So a 2004-2006 x3 has an identical cooling system as the 330i of those years.

Sent from my PC36100 using Bimmer App
i had just replaced my thermostat a couple months ago after it had failed. i replaced the expansion tank while i was at it and a couple of the hoses.

Kevin, most of the clamps are reusable. at least i reused all of mine. You should replace your A/T thermostat (Part #11 in the first diagram) since you'll be replacing your expansion tank.
i also recommend you replace your bleeder screw to the brass ones if you haven't already.
yep i know :thumbup:
i had 2 e46's before the X3 and i'm pretty familiar with the M46 engine.

unless you were talking to OP, then yes i agree. search the e46 forums. check the DIY section of e46fanatics.com too.
I would search changing the cooling system in the e46 forum. There are a ton of DIY pages and the m54 engine is exactly the same. So a 2004-2006 x3 has an identical cooling system as the 330i of those years.

Sent from my PC36100 using Bimmer App
Oops, my mistake. That was for the OP and I accidentally quoted your post for some reason. Sorry.
yep i know :thumbup:
i had 2 e46's before the X3 and i'm pretty familiar with the M46 engine.

unless you were talking to OP, then yes i agree. search the e46 forums. check the DIY section of e46fanatics.com too.
it's all good :hi:

oh and i meant to type M54 engine not M46, lol :lmao:
Oops, my mistake. That was for the OP and I accidentally quoted your post for some reason. Sorry.
Thanks for all the help got the new tank, upper hose, coolant sensor, and thermostat replace and old coolant out and new coolant in...
was it pretty easy to do? I am doing my waterpump, expansion tank and thermostat this winter
Yeah it was easy but I didn't do water pump and stuff
I have the same problem on my 2008 X3 Mtec 41k miles.
What do you think is a reasonable quote for a Water pump , tstat, expansion tank replacement job at BMW in NYC. :dunno:
I'm out of warrantee and being quoted 1.6k+
That seems high to me. All parts for a cooling system over haul cost around 500.00.
Total time for a DIY is about 3 - 4 hours.
I have the same problem on my 2008 X3 Mtec 41k miles.
What do you think is a reasonable quote for a Water pump , tstat, expansion tank replacement job at BMW in NYC. :dunno:
I'm out of warrantee and being quoted 1.6k+
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