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Old 08-19-2012, 07:49 PM   #41
JoeFriday
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Very Similar problem

Well, this thread isn't that old and better than starting a new thread.

Tex323GripIsKey, did you ever resolve this problem?

I also have a 2000 323i MT having pretty much exactly this same problem. Intermittent overheating when stopped or consistent driving below about 30mph. It doesn't do it all the time, but I can reproduce the symptoms pretty well by driving around normally for 15 minutes then sitting and idling in my driveway with the AC cranked to max (temp down to 59).

It was doing this, so I decided to do a full cooling system overhaul including
- Expansion tank
- water pump
- Thermostat
- hoses
- belts
- temp sensor
- radiator
- a few other random bits

Upon completion of said overhaul I refilled with BMW coolant 50/50 and filled/bled cooling system. I am pretty confident that I adequately bled the air out. After my first couple test drives I thought I had solved it, but today it was back, pretty much exactly the same.

Additionally, as I sat in my driveway waiting for this to reoccur I armed myself with a good powerful flashlight. Sure enough, after about 10 minutes the temp started to climb. The electric fan was definitely turning.

So, a question - Does the electric fan have multiple speeds? Mine seems to only turn at a single speed and isn't super powerful. I am considering that if it has a hi/lo switch mine is stuck in low.

Oh, I also had a dead bird and lots of feathers crammed into the AC radiator. I've hosed those out. No apparent damage to the radiator itself.
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Old 08-19-2012, 10:42 PM   #42
dmax
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Electric fan does, I think, have multiple speeds, but mine hardly ever comes on anyway...not if I'm going 30 mph.

Guys have misrouted the belts...it is possible...at least on the main one, I'm sure you could do the AC belt wrong too.

Bleed, bleed, bleed...read, read, read. When cold, turn heater on, rev to 2-3K rpms and turn off after 20 secs. (ET cap and bleeder closed!). Adjust level to between min and max level.
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Old 08-20-2012, 07:54 PM   #43
JoeFriday
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Quote:
Originally Posted by dmax View Post
Electric fan does, I think, have multiple speeds, but mine hardly ever comes on anyway...not if I'm going 30 mph.

Guys have misrouted the belts...it is possible...at least on the main one, I'm sure you could do the AC belt wrong too.

Bleed, bleed, bleed...read, read, read. When cold, turn heater on, rev to 2-3K rpms and turn off after 20 secs. (ET cap and bleeder closed!). Adjust level to between min and max level.
Been bleeding, bleeding, bleeding. I have not seen any change in level last couple times I checked it, so I think I have the air out.

Wow, misrouting belts seems like it would be really hard, but I have a Bentley manual and am quite confident they are correct.

I'm starting to think it is either my fan, or a sensor providing input to the DME.
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