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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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Old 03-14-2010, 04:05 AM
lansky lansky is offline
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Location: Arleta
Join Date: Jul 2008
Posts: 5
Mein Auto: 2004 BMW 325i
coolant icon lighting up in the **** pit

i have a 2004 325i every time i turn on the heater coolant icon lits up. so i bought some and to my surprise its still pretty full. does anyone have this problem
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Old 03-14-2010, 05:19 AM
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elhombre elhombre is offline
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Location: Severna Park MD
Join Date: Dec 2007
Posts: 479
Mein Auto: 2003 325i, '99 e36 328is
Try bleeding the system when it's at normal operating temperature, with the heater on full hot, fan speed low. Then check the coolant level after it has cooled off and add coolant as necessary. Check out the wiki on this site for the proceedure.
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Old 03-14-2010, 11:33 AM
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Solidjake Solidjake is offline
Zero. Leaks.
Location: NYC
Join Date: May 2007
Posts: 17,765
Mein Auto: '02 330i 6MT
Bleed your system.
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Old 03-14-2010, 12:36 PM
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smolck smolck is offline
Location: Birmingham, AL
Join Date: Jul 2007
Posts: 22,355
Mein Auto: 2004 ZHP Sedan
The reason it comes on with the heater on is because coolant is flowing through the heater core and that takes coolant out of the system. Try filling it at operating temp with heater on full blast OR bleed it as described above.

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