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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 12-05-2012, 01:14 PM
evans84 evans84 is offline
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Location: england
 
Join Date: Dec 2012
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Mein Auto: 318i auto 2002
hi

hi guys im new to all this how is everyone? i wondered if anyone can help me my 318i auto 2002 keeps running out of coolant and i dont know why please help
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  #2  
Old 12-05-2012, 01:29 PM
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Fast Bob Fast Bob is offline
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Mein Auto: 2004 330Ci ZHP 3 pedals
Possibilities:

One or more components failed/leaking (i.e., coolant reservoir, radiator, hoses, etc.)

Cracked head

Cracked block

Failed head gasket

Have the cooling system pressure-tested, and report back here.
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Old 12-05-2012, 03:09 PM
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bmwrocks bmwrocks is offline
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Join Date: Oct 2003
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Mein Auto: 2011 328i Convertible
MOST LIKELY cause is the coolant expansion tank is cracked and is leaking. This is a very common failure on your car. A lot of times it comes from overfilling the expansion tank, then after it pressurizes, it cracks around one of the hose fittings.
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