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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-12-2012, 02:41 AM   #1
e46freak609
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Join Date: Jul 2011
Location: atlantic city
Posts: 52
My Ride: 325 ci
Coolant question

So a couple of nights ago my radiator light turn on. then turned off. i thought it was only some kind of malfunction. But the next couple of days it did the same. My car never overheated. so after letting it cool down i check the coolant and it was completely empty. I then went to bmw and purchased some coolant and put some in (about quarter of a gallon) drove around a few miles and checked it. after checking it the measuring stick went down some. There has been no puddle or marks of any leaks ... Any ideas?
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Old 11-12-2012, 04:05 AM   #2
TArse
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Join Date: Nov 2010
Location: Columbus, GA
Posts: 668
My Ride: 03 330xi, 87 325is
Get under your car if you haven't already a d check for splattering. It could be a small leak. Probably from the ET
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Old 11-12-2012, 07:30 AM   #3
330iBlue
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Join Date: Nov 2012
Location: Texas
Posts: 38
My Ride: 05 330i
I just took off my radiator fan and noticed the lower radiator hose was leaking where the sensor plugs into it. The coolant would slowly drip on to the under car shield which prevented me from noticing coolant was leaking out. Bet you have the same problem.
Pretty cheap to replace and you might be able to get to it underneath the car. My fan is off so it's an easy fix from the top.
Bavauto notes, If you change it, make sure to replace the sensor as well. Using the old one can cause another leakage. BMA Auto had the sensor for $10, Bavauto had it for $24? Don't ask me why?
And If that is the issue, great time to flush the radiator. Use BMW coolant.

Here is a link I found on these site.
http://forum.e46fanatics.com/showthr...errerid=240032

Hope the link works. If not search for "Who has flushed their coolant themselves? " Good write up.
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Old 11-12-2012, 01:04 PM   #4
e46freak609
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Thanks for the reply guys!!!
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