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Old 11-13-2012, 06:31 PM   #1
NC330ci
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Help! with Expansion tank removal

Hey doing coolant system overhaul now....came to expansion tank removal.

Following http://www.bmw330ci.net/maintenance/completecoolant.php DIY

Confused and stuck on this bottom hose. Doesn't seem to be mentioned in the DIY.

I removed the heater core hose.
Removed the coolant sensor
Removed U clip
And dislodged the Expansion tank


But theres the other hose, that seems to be connected to the rear blue drain plug.

Am I supposed to pull this tube out, or does it dislodge from pulling up on the expansion tank, which I already kinda tried (very gently)

the Red arrow from the top View is the hose in question, the green arrow is the heater core hose

bottom view show the hose in question connected to the bottom of the expansion tank where the rear blue draining screw is

Thanks




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Old 11-13-2012, 06:39 PM   #2
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If I remember correctly, it is connected to a plate/connection on the bottom of the tank. I think you need to separate them at the bottom of the tank.

EDIT:

http://realoem.com/bmw/showparts.do?...40&hg=17&fg=05

Yep. Look at the bracket above #2
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Last edited by jneumann; 11-13-2012 at 06:41 PM.
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Old 11-13-2012, 08:52 PM   #3
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thanks, ill try this tomorrow. To tired after spending my whole afternoon to get that lower hose off.
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Old 11-13-2012, 09:19 PM   #4
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Your struggle is with the trans cooler t-stat, hope you purchased a new one because its probably broken. You need to pull up hard on the expansion tank, it is stuck on this trans fluid t-stat. Pull harder, dO not remove additional hose.
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Old 11-13-2012, 09:35 PM   #5
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I had a lot of trouble taking that hose out too, I used a flathead and some leverage to slowly move it out.
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Old 11-13-2012, 09:46 PM   #6
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yea me too i used a flat head screwdriver carefully to leverage it out, and pull up the expansion tank at the same time
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Old 11-14-2012, 06:18 AM   #7
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Originally Posted by silvrXI View Post
Your struggle is with the trans cooler t-stat, hope you purchased a new one because its probably broken. You need to pull up hard on the expansion tank, it is stuck on this trans fluid t-stat. Pull harder, dO not remove additional hose.
I have a manual transmission. Isnt the transmission cooler thermostat for Automatic transmissions only?

So this is where i think I went wrong. I didnt realize that there was a mounting bracket underneath the expansion tank.

I did the jack and socket extension method of dislodging the expansion tank.
I centered the socket under the bracket, so the whole assembly (expansion tank + mounting bracket) dislodged. When I was supposed to point the socket solely under the Expansion tank.

So now am I thinking I should try to remount the assembly on the bracket and either pull up on the expansion tank alone or jack method again

Hopefully I didnt break anything by jacking up the whole assembly

Last edited by NC330ci; 11-14-2012 at 06:19 AM. Reason: more
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Old 11-14-2012, 10:53 AM   #8
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Quote:
Originally Posted by NC330ci View Post
I have a manual transmission. Isnt the transmission cooler thermostat for Automatic transmissions only?

So this is where i think I went wrong. I didnt realize that there was a mounting bracket underneath the expansion tank.

I did the jack and socket extension method of dislodging the expansion tank.
I centered the socket under the bracket, so the whole assembly (expansion tank + mounting bracket) dislodged. When I was supposed to point the socket solely under the Expansion tank.

So now am I thinking I should try to remount the assembly on the bracket and either pull up on the expansion tank alone or jack method again

Hopefully I didnt break anything by jacking up the whole assembly

Correct - ATT (auto. trans. thermostat) are found only on automatics.

Unfortunately, you did it incorrectly.. You should have jacked up Only on the bottom of the expansion tank and NOT on the mounting bracket. I would strongly advise you go ahead a purchase a new mounting bracket.

Last edited by BimmersGarage; 11-14-2012 at 10:54 AM.
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Old 11-14-2012, 10:56 AM   #9
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hey guys, i tried reseating the expansion tank along with base against the radiator bracket, but the top of the ET is sitting loosely at the top. Thus, im not able to get enough leverage to knock it off the base. Every time i knock at it, it just comes loose off the radiator bracket.

I guess the other option is to disconnect the hose thats connected to the base and take the whole assembly out (ET + base) and then work on it from outside the car. But Im afraid of disconnecting that lower hose as it seems it may be a Pain to reconnect.

Anyone have any experience with doing that.

Otherwise im stuck...

thanks in advance
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Old 11-17-2012, 07:18 PM   #10
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I saw this post a few days ago. Today, I had it in mind while I was replacing my cooling system. This is the first time for this car, which I bought a couple months ago. It has 96,000 miles on it, and it's a manual. I got everything apart, except the hose OP mentions that connects to the expansion tank support. I was able to get the expansion tank off with great difficulty, although this expansion tank is making me miss the old E36 expansion tank. I cannot get the new expansion tank to press into the expansion tank support.

I couldn't get the hose that connects to the expansion tank support loose, but realized that I really didn't have to, since I'm not replacing the support. However, this part is plastic, will fail due to brittleness, and should be part of Mango's parts list, since failure will result in a coolant dump. It's on my list for near term maintenance.

Does anyone have a good method to press the expansion tank onto the support? Should this be a simple press/click installation? Mine hangs up about 1/4" short of seating, and I'm at my wits end trying to get it to seat.
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Old 11-18-2012, 10:29 AM   #11
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From everywhere I read, you should lubricate the mating surfaces w/ coolant and push straight down. i didn't see anywhere where, anyone mentioned another method or any tricks.

In my case I ended up buying the new bracket and the hose that connects to the support. I installed everything else back together. There were no leaks and no issues. Took it to my indy and he replaced the expansion tank/bracket/lower hose.

Everything working great so far
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Old 11-18-2012, 01:53 PM   #12
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From everywhere I read, you should lubricate the mating surfaces w/ coolant and push straight down. i didn't see anywhere where, anyone mentioned another method or any tricks.
+1 on lubing all O-rings when assembling. They can get real kinked up if you try this dry.
I prefer using my silicone O-ring lube, but I guess coolant works OK as so many have used it without complaining.
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Old 11-18-2012, 04:39 PM   #13
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I ended up using radiator hose lube, found at the counter at Autozone. It worked like a champ!
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Old 11-21-2012, 12:37 PM   #14
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I'm getting ready to put my expansion tank back on (replaced rad & water pump), and I can hear things/parts shaking around inside the tank. Is that the level float, or do I have bigger problems?
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Old 11-21-2012, 12:41 PM   #15
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I did an auto past weekend. To pop the expansion tank off, I found wedging a screw driver and prying up between the tank and the bracket easily popped it off. Make sure its large heavy duty screwdriver.

As for the hoses, lift the clamping pin upwards then gently persuade it with a screwdriver.

On the auto I did, the auto t-stat lifted out easily without any damage whatsoever using a rag and my hand. It had the original date stamp on it and i was surprised it didn't break.

I would also recommend replacing the o-rings on the auto trans cooler.

The auto is so so so much more work than the manual! so many lines and coolers everywhere.
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Old 11-21-2012, 12:54 PM   #16
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There are moving parts inside the expansion tank, don't sweat it, one is the float stick up top and the other is a float ring around the coolant sensor cavity in the bottom.



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I'm getting ready to put my expansion tank back on (replaced rad & water pump), and I can hear things/parts shaking around inside the tank. Is that the level float, or do I have bigger problems?
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Old 11-21-2012, 01:25 PM   #17
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Thanks dude..
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Old 11-21-2012, 01:29 PM   #18
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Quote:
Originally Posted by wildirish317 View Post
I saw this post a few days ago. Today, I had it in mind while I was replacing my cooling system. This is the first time for this car, which I bought a couple months ago. It has 96,000 miles on it, and it's a manual. I got everything apart, except the hose OP mentions that connects to the expansion tank support. I was able to get the expansion tank off with great difficulty, although this expansion tank is making me miss the old E36 expansion tank. I cannot get the new expansion tank to press into the expansion tank support.

I couldn't get the hose that connects to the expansion tank support loose, but realized that I really didn't have to, since I'm not replacing the support. However, this part is plastic, will fail due to brittleness, and should be part of Mango's parts list, since failure will result in a coolant dump. It's on my list for near term maintenance.

Does anyone have a good method to press the expansion tank onto the support? Should this be a simple press/click installation? Mine hangs up about 1/4" short of seating, and I'm at my wits end trying to get it to seat.
keep an eye on the hook on the back of the expansion tank (facing the front of the car) it hooks on TOP of the hole of the expansion tank bracket. imagine like a coat hanger being hung on a pole in the closet. once thats touching/seated, push in the expansion tank clamp at the bottom and it should snick into place.
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Old 11-21-2012, 06:11 PM   #19
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keep an eye on the hook on the back of the expansion tank (facing the front of the car) it hooks on TOP of the hole of the expansion tank bracket. imagine like a coat hanger being hung on a pole in the closet. once thats touching/seated, push in the expansion tank clamp at the bottom and it should snick into place.
Thanks Mango. I did get it to push on. It wasn't the tab in the back, which I knew to line up. It was raw rubber o-ring vs. dry plastic nozzle. Once I stopped by Autozone and got some radiator hose lube, things slid together nicely.

Didn't think of it at the time, but I have a tube of KY jelly (don't even go there! ) that probably would've served the same purpose.
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