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Old 01-13-2015, 03:22 PM   #1
Tfig
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Join Date: Jan 2015
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New Year / New Issues

Hello Everyone ...
Hoping you can help me with my issue, I own a '2000' 323i with 99,000 miles and today I replaced my coolant expansion tank due to a crack in it along with the oil thermostat. But now the heater doesn't work and it overheats , I have tried to bleed it since I changed the expansion tank, only steam comes out of the bleeder screw and its filled to the top and water just boils . I think its the thermostat or water pump, my thought process is the reason why expansion tank cracked was because water in the tank wasn't being displaced like it should , therefore it expanded and cracked. Penny for your thoughts ....
Thanks ......
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Old 01-13-2015, 03:25 PM   #2
kkasson
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You have to bleed it when the engine is cold. If there's steam coming out, you must be doing it with the engine hot..?
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Old 01-13-2015, 04:25 PM   #3
Alex323Ci
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i'd make sure it's bled properly. do it again.
you should be able to see the water cycle with cap off (do not take cap off when Hot!) to see if the water pump is working.

also don't overfill the expansion tank. it has a bobber, it's not like the older cars where you fill it up to the radiator neck. it's an expansion tank not a radiator neck.
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Old 01-14-2015, 09:14 AM   #4
Tfig
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Thanks for all the help , I will definitely try your suggestions and will keep you posted of the outcome .....
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Old 01-14-2015, 11:52 AM   #5
kkasson
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Follow this video exactly and you shouldn't have any problems.



Make sure you take out the excess afterwards. Remove coolant until the float drops down to the correct level.
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Old 01-14-2015, 05:54 PM   #6
Heilbronner
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The plastic screw has to be taken off, when coolant is added, so the air can gets out!


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Old 01-14-2015, 07:12 PM   #7
H.A.L. 9000
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I had this exact issue on the exact same car. It's bubbles in the coolant system. If you have a floor jack, use the jack point on the side of the car to jack it almost all the way up. Make sure your rear wheels are chocked and begin the bleeding process. When you jack the front of the car up in the air, it makes it much easier for all the air in the system to find it's way to that bleed screw.

I couldn't, for the longest time, figure out how to get my heat back... but this worked. My car now stays around 100C on the temp scale and my heater blows heat so hot it makes my Nike Free's smell burnt. lol. Win-win.

I should also add, use the drivers side jack point as it's the side the bleed screw is on.

Last edited by H.A.L. 9000; 01-14-2015 at 07:18 PM.
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