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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 10-04-2014, 05:54 PM
Srlambo Srlambo is offline
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Mein Auto: e46 328i
Leakiing expansion tank

replaced my e46 328i expansion tank with OEM parts by Hamman from amazon. I also change the coolant sensor and the coolant light on the dash stay on after filling the coolant reservoir with coolant. Please help my bimmer family.
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  #2  
Old 10-04-2014, 05:56 PM
jfedor jfedor is online now
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Did you bleed the system? Only other thought is a bad sensor.
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Old 10-04-2014, 11:11 PM
GoForthFast GoForthFast is offline
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Does the ET have the BMW ensignia stamped into it?

Bad ET can cause your problem.
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Old 10-05-2014, 03:31 AM
harleyrob harleyrob is offline
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Quote:
Originally Posted by Srlambo View Post
replaced my e46 328i expansion tank with OEM parts by Hamman from amazon. I also change the coolant sensor and the coolant light on the dash stay on after filling the coolant reservoir with coolant. Please help my bimmer family.
When you say ET is leaking. What do you mean? Leaking where exactly? I'm assuming you are "seeing" a leak? Or assuming cause coolant light on?
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  #5  
Old 10-05-2014, 02:43 PM
Srlambo Srlambo is offline
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Yes, I did bleed the coolant bleeder valve on several time to no avail. I also used both the old and new sensor
, the old sensor worked before I stated the job.
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  #6  
Old 10-05-2014, 02:49 PM
Srlambo Srlambo is offline
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The ET is an after market tank, should it be BMW only parks.
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  #7  
Old 10-06-2014, 12:15 AM
mikesmith2 mikesmith2 is offline
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Also check that the pipes on the top of ET are pushed on fully.

Some one had done some work on my car before I bought it and one of the pipes wasn't pushed fully home causing a leak that looked like it was ET
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Old 10-06-2014, 12:57 AM
SilberVogel SilberVogel is offline
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Quote:
Originally Posted by Srlambo View Post
The ET is an after market tank, should it be BMW only parks.
Common issue with aftermarket expansion tanks. Thereís a magnet inside that triggers the light and some aftermarket tanks are either just designed poorly or donít even have the magnet.

If I remember correctly, OEM is CoolXpert. Would only go OEM or OE (Genuine BMW) for the expansion tank, given its susceptibility to failure and it being such a critical part. Canít stress this enough.

If you want to troubleshoot the sensor with another part, your washer fluid level sensor can also be used, but odds are it's the expansion tank.
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