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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 06-05-2013, 06:34 PM   #1
Registered User
Join Date: May 2013
Location: Hamilton, Ontario
Posts: 50
My Ride: 2002 e46 330i
Cooling Troubles Continue

Hey all,

Just wanted to preface this message by again thanking everyone in this forum. In the last year or so I've gone from a guy who had only ever flipped on and off tires to a guy who has done his rotors, pads, replaced a caliper, thermostat, water pump, coolant hoses, belts, power steering reservoir etc. etc. Its all thanks to people like you on here that have helped me discover a love for the wrench. Now I need more help.

I've been fighting my e46 330i's (180,000km) coolant system for a while now. At this point, all of the usual suspects have been replaced, including the expansion tank, upper hose that connects to it (twice, one made a bad seal), the water pump, the thermostat the lower hose, the radiator. At this point the system is finally developing no leaks (the last one was eliminated by replacing the upper hose for a second time). I have bled the system out multiple times and am satisfied that I have done it correctly.

My problem now is that my engine from time to time starts to overheat again. I originally thought that this only occurred when I turned the AC on (bad fan or fuse that controls it) but it does it regardless of AC unit status. On the occasions that it has begun to creep past the center point, turned the heat to full blast brings it back to center rather quickly, and then immediately turning the heat off seems to keep it there (although I have not driven it any real length after doing this as my commutes are always short). There is no steam coming from the engine bay (as there was with all the other problems obviously) and the system is sealed and not leaking.

My guess is that it is either the fan or the sensor that goes into the lower radiator hose (the hose I've replaced) but I can't recall its name. EDIT: I should have made note of the fact that the AC will not blow cold air

Can anyone make a suggestion for me as to what I should look at to diagnose and fix this?


Last edited by KyleAndrew; 06-05-2013 at 06:35 PM.
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Old 06-05-2013, 06:51 PM   #2
Registered User
Join Date: May 2013
Location: Hamilton, Ontario
Posts: 50
My Ride: 2002 e46 330i
Just noticed this thread right below my new one here, my answer may be in there but if anyone has any other thoughts on my issue I'd like to here them. Here is a link to a Fan Related thread for future reference:

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