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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 03-12-2012, 03:35 PM
izzyinstl izzyinstl is offline
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Location: St Louis Metro East
 
Join Date: Jun 2009
Posts: 80
Mein Auto: 528i
97 528i Expansion Tank questions w pics

My 97 528 keeps over-heating, today I was changing the thermostat and upon removal of expansion tank, i found broken pieces of tan colores plastic and a small gasket in the bottle.Uploaded from the Photobucket Android App There are also 2 larger pieces loose inside...Uploaded from the Photobucket Android App

Also, the replacements that I found have a level sensor, mine just had a black plastic bolt on it (no level sensor)...Uploaded from the Photobucket Android App

I have already ordered an OEM (supposedly) from AutohausAZ but after reading i am leery because it's a Behr I ordered the one with out level sensor.

Q: What is the broken part(s)? They crumble with any pressure.

Q: Why wouldn't I have a level sensor?

Q: could the broken piece be causing my overheating? It only overheats for a few seconds then I rev or go fast and it goes right back to middle.

it is not leaking coolant

ps Ive already changed the fan clutch and the radiator looks to have been changed as current is a nissens. The ts housing has also been replaced.


Thanks for your thoughts!

Izzy
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Last edited by izzyinstl; 03-12-2012 at 03:39 PM.
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  #2  
Old 03-12-2012, 04:44 PM
cn90 cn90 is offline
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Location: Omaha NE
 
Join Date: Mar 2006
Posts: 12,315
Mein Auto: 1998 528i 5-sp 103K miles
1. Go to dealer and buy a BMW reservoir. No other brand!

2. Do a complete cooling overhaul. You may have bad WP impeller etc.
Best is to replace them all:

1998 528i ENTIRE COOLING SYSTEM REPLACEMENT Tips and Tricks:
http://bimmerboard.com/forums/posts/199986
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Old 03-12-2012, 05:02 PM
izzyinstl izzyinstl is offline
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Location: St Louis Metro East
 
Join Date: Jun 2009
Posts: 80
Mein Auto: 528i
Thanks CN90, thanks for the great write up! I've read it many times. I'm curious, the autohauAZ lists the BEHR as OEM and another dealer told me that behr does make some parts for BMW. If in fact the Behr replacement is OEM, would they really make another part with same exact specs cheaper? Cheaper as in parts/material. The cost was also half of what a BMW dealer wants.

Any idea of those pieces in my tank?

Thanks Izzy
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  #4  
Old 03-12-2012, 08:18 PM
cn90 cn90 is offline
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Location: Omaha NE
 
Join Date: Mar 2006
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Mein Auto: 1998 528i 5-sp 103K miles
Many many many many moons ago (1980s and 1990s), the Behr after-market reservoir was exactly the same as the BMW reservoir.

For the last few years, Behr moved some of their factories to China and you guess it right, the reservoir is basically a piece of sh*t.
Get the BMW reservoir (which is made to a much higher standard) if you don't want to blow your engine.
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Old 03-13-2012, 06:24 AM
izzyinstl izzyinstl is offline
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Location: St Louis Metro East
 
Join Date: Jun 2009
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Mein Auto: 528i
Quote:
Originally Posted by cn90 View Post
Many many many many moons ago (1980s and 1990s), the Behr after-market reservoir was exactly the same as the BMW reservoir.

For the last few years, Behr moved some of their factories to China and you guess it right, the reservoir is basically a piece of sh*t.
Get the BMW reservoir (which is made to a much higher standard) if you don't want to blow your engine.
I did a little further research on these and called a dealer and he pulled an expansion tank and advised me that the tank sold by them (bmw of south atlanta) has the bmw stamp and it's manufacturer logo on it is GP. So I guess GP (what ever that stands for) is the current manufacturer of this part. Just so everyone knows.
He also checked my vin and confirmed that my 528i does NOT have a level sensor.

again, thanks CN90!!!!
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  #6  
Old 03-15-2012, 06:42 AM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
Posts: 19,190
Mein Auto: 02 BMW 525i M54 automatic
S'more references ...
- Behr radiator and Behr/Heat expansion tank autopsy (1) (2) & request for another Behr surge tank autopsy (1) & why new made-in-China Behr/Hella expansion tanks are DOA (1)

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