Asked by May 15, 2017 at 11:55 AM about the 1999 BMW 3 Series 318i

Question type: General

my bmw318i overheats and water comes out
through the water bottle lid. i cant possibly see any
leaks on radiator or any horse. thermostat was
changed recently. I have a new  raditor .can
someone help on this one.

8 Answers


The cooling system probably has an air bubble stuck in it and it needs to be bled. Look up the bleeding procedure for your car on Bimmerfest or Bimmerforums.

I checked the cooling system but it is not that. the fan is working, there is a new water bottle added in as well. The thermostat is now removed and it only heats up in traffic.


Well, if it's overheating and there is coolant coming out of the reservoir, it's definitely the cooling system. When you replaced the bottle, did you bleed it properly? Like I said, there is probably an air bubble or some type of blockage preventing coolant flow.

2 of 2 people found this helpful.

yes, Silverton radiators fitted it on and they bleed the system and checked the water flow.


Had the car been overheating for more than a minute or two at some point? How does the oil look? And the coolant too for that matter?


It could be a bad head gasket causing the excess coolant pressure.

Yes it would overheat in traffic then I had to switch it off or usually when it heats up in traffic I try to get onto a open road where i drive it at 60km/h n then the heat gauge drops back to half


Yeah, this could be a head gasket issue. Your engine has an aluminum cylinder head, and being much softer than iron, it tends to warp when it is overheated for a long period of time, which in this case could be as little as 5-10 minutes. What does your oil look like? Any chocolate milk color?

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