E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > BMW Regional Forums > Regional Forums > Australia

Australia
Check out other E46Fanatics members rides in the Enthusist Directory!

If you don't have your garage setup, sign up today HERE

Reply
 
Thread Tools Search this Thread Rating: Thread Rating: 1 votes, 5.00 average. Display Modes
Old 12-15-2012, 07:45 PM   #1
TitanSilverE46
Registered User
 
Join Date: Nov 2010
Location: Melbourne Australia
Posts: 276
My Ride: 2001 318i & 325i
Lucky Escape

Just bought a 2001 318i to complement my wife's 2001 325i and replace my aging 1993 525i (394,000km).

Picked up car Thursday and drove 80km home. Car drove well.

Friday morning, washed and cleaned car and checked oil and water - all normal. Fixed a few minor issues and went for a short drive. Yellow low water light came on for 10 secs - curious, perhaps a faulty sensor.

Changed and went out for lunch, 20km away, all good. Did some errands and noted low water light came on again, this time for 30 secs. All the time the temp only rose to 12 o'clock position. Raining now, arrived home and switched off while I moved the 525 out of garage to make room for 318i. Only then saw steam coming from around the bonnet. Thought it might be heat from engine steaming the rain drops off the bonnet. Backed into garage, temp still at 12 o'clock, and switched off. Water everywhere. Let it cool off and looked for problem. Hoses seemed OK, radiator and electric fan dry.

In the morning proceeded to refill system. Massive split in expansion tank!

Waiting for a new tank from Clickable (thanks Lucas) and it should assemble and be all good again.

A lucky escape as it seemed to have blown during the 5 mins it was sitting in the drive.
__________________
TitanSilverE46 is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 12-15-2012, 09:50 PM   #2
Davconelectric
Registered User
 
Join Date: Apr 2011
Location: Sunny melbourne
Posts: 1,911
My Ride: 330
Cool story bro
__________________
Davconelectric is offline   Reply With Quote
Old 12-15-2012, 10:15 PM   #3
Jall
Registered User
 
Join Date: Oct 2008
Location: Melbourne, AUS
Posts: 992
My Ride: 328Ci
Don't just replace the expansion tank, do everything at the same time and not worry about the cooling system for another 100k km.
__________________

Last edited by Jall; 12-15-2012 at 10:15 PM.
Jall is online now   Reply With Quote
Old 12-15-2012, 10:39 PM   #4
TitanSilverE46
Registered User
 
Join Date: Nov 2010
Location: Melbourne Australia
Posts: 276
My Ride: 2001 318i & 325i
Quote:
Originally Posted by Jall View Post
Don't just replace the expansion tank, do everything at the same time and not worry about the cooling system for another 100k km.
I do agree with this approach ... Thermostat is definitely new and both hoses look like they have been replaced relatively recently.

Water pump is definitely the original, rust on shaft and oxidation on the aluminium housing. At least on the 4cyl M43TU engine it is easy to get to.

Next job, change the DISA valve which is getting noisy and get window regulators ready for the inevitable!

When I bought the 325i two years ago, I found the thermostat not working and changed it, both hoses and expansion tank. Water pump was removed, checked and replaced with new gasket.
__________________
TitanSilverE46 is offline   Reply With Quote
Old 12-15-2012, 11:08 PM   #5
DamoBMW
Registered User
 
Join Date: Sep 2011
Location: Melbourne, Australia
Posts: 745
My Ride: '02 325Ci M-Sport
Cooling guide:

http://forum.e46fanatics.com/showthread.php?t=914109
__________________
'02 BMW 325Ci 5MT M-Sport Individual Stratus Grey
DamoBMW is offline   Reply With Quote
Old 12-17-2012, 02:14 AM   #6
TitanSilverE46
Registered User
 
Join Date: Nov 2010
Location: Melbourne Australia
Posts: 276
My Ride: 2001 318i & 325i
Well, I have had an even luckier escape! When I pulled the old expansion tank, I noted a spring and bronze valve sitting in the socket that the expansion tank plugs into. Not knowing what to expect I thought this was normal. The spring appeared to seat in the bottom of the expansion tank.

While waiting for my new expansion tank to arrive, I had a look at a few Youtube videos when I came across this:-

.

While I don't necessarily agree with the guys thoughts on expansion tank failures, I could see that the spring and valve I had were supposed to be part of a larger assembly. No sign of the top part at all. When I tried to remove the lower part, the plastic disintegrated and I had one hell of a job getting the rest of it out.

The part is called the Auto Transmission Thermostat, part # 17111437362 and is $90 at Clickable. Lucas is express posting one to me so I can install it with the expansion tank.

Any of you have a similar trashed thermostat?
__________________
TitanSilverE46 is offline   Reply With Quote
Old 12-17-2012, 02:27 AM   #7
TurnersInOz
Registered User
 
Join Date: Dec 2011
Location: Brisbane
Posts: 492
My Ride: 2004 325i
This is one of the common points of failure in the cooling system.
So is the temperature sensor on the lower radiator hose (the o-ring, specifically).
There are a few main reasons why many believe that replacing everything in one go is the best way... After you buy all the parts that did or most likely will go bad, you've bought most of the system. And it's better to do it once and be done.
Unless, of course you like taking it apart....
TurnersInOz is offline   Reply With Quote
Old 12-17-2012, 02:46 AM   #8
TitanSilverE46
Registered User
 
Join Date: Nov 2010
Location: Melbourne Australia
Posts: 276
My Ride: 2001 318i & 325i
Quote:
Originally Posted by TurnersInOz View Post
.... Unless, of course you like taking it apart....
I always like to see if I can do a DIY quicker the second or third time
__________________
TitanSilverE46 is offline   Reply With Quote
Old 12-17-2012, 02:50 AM   #9
TurnersInOz
Registered User
 
Join Date: Dec 2011
Location: Brisbane
Posts: 492
My Ride: 2004 325i
Truth be told, I've gotten pretty good at it too!
TurnersInOz is offline   Reply With Quote
Old 12-17-2012, 05:30 AM   #10
trive2
Registered User
 
Join Date: Sep 2011
Location: Brisbane
Posts: 1,100
My Ride: 1989 BMW 535i
Quote:
Originally Posted by TitanSilverE46 View Post
Well, I have had an even luckier escape! When I pulled the old expansion tank, I noted a spring and bronze valve sitting in the socket that the expansion tank plugs into. Not knowing what to expect I thought this was normal. The spring appeared to seat in the bottom of the expansion tank.

While waiting for my new expansion tank to arrive, I had a look at a few Youtube videos when I came across this:-

.

While I don't necessarily agree with the guys thoughts on expansion tank failures, I could see that the spring and valve I had were supposed to be part of a larger assembly. No sign of the top part at all. When I tried to remove the lower part, the plastic disintegrated and I had one hell of a job getting the rest of it out.

The part is called the Auto Transmission Thermostat, part # 17111437362 and is $90 at Clickable. Lucas is express posting one to me so I can install it with the expansion tank.

Any of you have a similar trashed thermostat?

Yup. Common problem. Mine nearly destroyed my transmission.
__________________
trive2 is offline   Reply With Quote
Old 12-19-2012, 01:32 AM   #11
TitanSilverE46
Registered User
 
Join Date: Nov 2010
Location: Melbourne Australia
Posts: 276
My Ride: 2001 318i & 325i
Fitted Auto Transmission Thermostat and then new expansion tank. I checked the operation of the low coolant sensor. Interestingly, the sensor itself does not enter a water gallery. It is a reed switch operated by a float with an attached magnet in a fluid passage alongside the sensor pocket. So for anyone's benefit, you can change the sensor without loosing any fluid. ... neat!

Clipped up the bottom of the expansion tank and the two clips on the upper radiator hose and proceeded to bleed the system using the standard procedure mentioned many times elsewhere. When no further bubbles came out I closed the bleed screw and replaced the cap. On starting the car and giving it a few revs, I heard a couple of gurgles from the heater, so leaving the car idling, I opened the bleed screw and got a few more bubbles out. A short drive and the gauge sits in the middle and no more gurgling so I think I have it licked ... Hope so anyway.

So for Auto owners, replace the Auto Transmission Thermostat when doing an expansion tank replacement.

Cheers and a Merry Christmas to all.
__________________
TitanSilverE46 is offline   Reply With Quote
Old 12-19-2012, 08:50 PM   #12
spacemaster
Registered User
 
Join Date: Oct 2011
Location: Sydney
Posts: 86
My Ride: E46 328i
Could not agree more on the Auto tranny thermostat. Sound like you good for another while
spacemaster is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 01:35 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use