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^ mmk it makes sense to me. So yours went about 100k miles till it cracked or till you replaced it. i have 123K miles on my 99 328i.
 

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So with all the cracking exspansion tanks i took a look at mine. I noticed a sticker on it and it had the build date of my car, does this mean its the original one?:eek:
It could be, but the 'official' build date of your car is on a sticker placed on the pillar inside the drivers door. It is in a mo/yr format (i.e 02/01 means it was built in Feburary, 2001).
 

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Mine went at ~115K.
 

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Mine blew at 190,000 KM replaced it and the new one blew again, can anyone help with an explanation please? Checked everything I can think of. Only thing I can think of is that the cap is not releasing the pressure.
 

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mine went at 175,000Km anyone know the website to get BMW OEM part numbers to order in AUS? thanks guys!
 

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Mine blew at 190,000 KM replaced it and the new one blew again, can anyone help with an explanation please? Checked everything I can think of. Only thing I can think of is that the cap is not releasing the pressure.
I remember reading about the caps and being told by a service tech about the caps and the tiny valves in them to regulate the pressure. Valves can get 'gunked' up over time and don't regulate properly putting more expansion/contraction pressure on the expansion tank (the irony). The repeated cycles causes very tiny cracks and failure over time. Cheap preventative maintenance: My coolant and cap have been changed once already and i'll probably do it every 2 - 3 yrs.

This from research and service tech. Don't know how true but caps are cheap and aluminum heads and blocks aren't.
 

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Mine went last winter @ 84k. N2s:Dont do donuts 1 min after starting your car in the freezing cold.
 

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Where is the build date on the expansion tank?

I've got a '99 328i with 193K on it. On the top of the expansion tank is a 7/06 date, but that's on the 'hose' portion of the tank next to bleeder valve and I'm not sure if that's the tank or the hose (which was replaced in 8/06).

If the date tag is on the top, I'm good. If it's somewhere else, I've got to look...and pray!

Thanks,

Doug
 

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No. Description Supplement Qty From Up To Part Number Price Notes
For vehicles with
Manual Transmission
01 Mounting plate 1 17111436250 $54.57
02 Screw plug 1 17111707818 $3.35
03 EXPANSION TANK 1 06/2007 17137787039 ENDED
03 EXPANSION TANK 1 17117573781 $79.43
04 Clamp 1 17111707777 $3.43
05 LEVELLING SWITCH 1 17137524812 $17.42 +core
06 Radiator cap 2,0BAR 1 17111742231 $17.82 +core
07 Screw self-tapping D6X20 ZNS3 2 17117536971 $1.12
08 Label 1 17111439721 $3.15
11 Universal socket housing uncoded 2 POL. 1 61138365340 $2.98
only in conjunction with
-- BUSHING CONTACT 0,2- 0,5MM² 2 61130005199 $1.88
-- BUSHING CONTACT 0,75MM² 2 61130006665 $1.97

^I dont need to order all of this for this job do i? Also does anyone know where i can find a thermostat? tischer doesnt seem to have one in stock.
 

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Mine went at ~60K & have to be towed home. :ben:

 
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