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DIY: Do It Yourself
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Old 06-12-2014, 11:46 AM   #1
99e46bmw
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328i Overheat need help asap

I have read different forums and threads for weeks now........

99 bmw 328i
automatic

Keeps spewing water from expansion tank cap, its overheating.
Changed thermostat, waterpump.... The top and lower hoses are getting hot, and the heat does work great. Did compression test today results are
150-150-120-120-150-150 car does have 200k, someone told me they didn't think it was the head gasket. Any help would be great, i'm about to lose my mind,lol....
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Old 06-12-2014, 03:41 PM   #2
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It keeps spewing water from the expansion tank cap? Have you changed the expansion tank?


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Old 06-12-2014, 03:49 PM   #3
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This sounds like your cooling system may have air in the system. There is a filling procedure and a bleeding procedure. Re-read it and make sure you followed it exactly.

http://www.e46fanatics.com/forum/sho...d.php?t=689618
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Old 06-12-2014, 10:48 PM   #4
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Yeah i've read the bleeding process many times.....

It seems that its building TONS of pressure in the hose which is causing it to spew out of the cap. I replaced the cap today. Still doing it. While the car is hot, i can hold the radiator, (well touch) its a little warm but not much.. Haven't replaced the expansion tank yet. I noticed just now that the water return line, (hard plastic pipe under the intake manifold) is leaking some, could that cause the pressure build up and over heat? The coolant temp got to 235 degree when it started over heating....
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Old 06-12-2014, 10:59 PM   #5
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Originally Posted by 99e46bmw View Post
Yeah i've read the bleeding process many times.....

It seems that its building TONS of pressure in the hose which is causing it to spew out of the cap. I replaced the cap today. Still doing it. While the car is hot, i can hold the radiator, (well touch) its a little warm but not much.. Haven't replaced the expansion tank yet. I noticed just now that the water return line, (hard plastic pipe under the intake manifold) is leaking some, could that cause the pressure build up and over heat? The coolant temp got to 235 degree when it started over heating....
I'm not sure that leak would cause your issue, but it needs to not be leaking. This still sounds like air in the system. The air turns to steam then when it reaches a high point in the system it pushes coolant out of the weakest point. I chased a similar problem for a couple of hours last summer.
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Old 06-12-2014, 11:11 PM   #6
99e46bmw
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Originally Posted by erickonphoenix View Post
I'm not sure that leak would cause your issue, but it needs to not be leaking. This still sounds like air in the system. The air turns to steam then when it reaches a high point in the system it pushes coolant out of the weakest point. I chased a similar problem for a couple of hours last summer.
I know it sure has been a pain in the a$$! Those compression numbers look ok? #3-4 lower than the rest. I'm going to try to fix that water return pipe tomorrow. What i don't get is, last month it did this, thats when i replaced the thermostat, and it hasnt done it since until the other day. Since the heat works and top and bottom hoses are hot. (both hoses kinda swell) i assume the thermostat is working correctly.....
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Old 06-12-2014, 11:17 PM   #7
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Originally Posted by 99e46bmw View Post
I know it sure has been a pain in the a$$! Those compression numbers look ok? #3-4 lower than the rest. I'm going to try to fix that water return pipe tomorrow. What i don't get is, last month it did this, thats when i replaced the thermostat, and it hasnt done it since until the other day. Since the heat works and top and bottom hoses are hot. (both hoses kinda swell) i assume the thermostat is working correctly.....
I have an early day so I have turn in now but answer this.
Under what conditions does your vehicle overheat? moving or stationary or both?
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Old 06-12-2014, 11:27 PM   #8
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Originally Posted by erickonphoenix View Post
I have an early day so I have turn in now but answer this.
Under what conditions does your vehicle overheat? moving or stationary or both?
Both....... It sat running for almost an hour without overheating, then it started..
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Old 06-14-2014, 01:02 PM   #9
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Is there a way to test the thermostat? I just replaced it a month ago, but maybe it failed?
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Old 06-14-2014, 09:06 PM   #10
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UPDATE----- Took water pump out, looked brand new.... Took thermostat out, thats fine..... I noticed that small pinhole again in that water return line under the intake, cold that cause the overheating? Also, i have an aluminum radiator, could it be clogged? Also what about expansion tank, how would that fail? I''ts still blowing coolant out of the cap......
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Old 06-15-2014, 06:48 AM   #11
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You could have 'both' - a blockage/restriction and air in the system because of it. Since it took a while for it get hot and spew coolant from the cap, there could be a restriction somewhere that takes a while for its affect to show. Once it does you blow some coolant out, which is replaced by air, which then creates its own problems adding to the first.

At 200k miles you should have rebuilt the entire system (radiator, hoses, thermostat, thermostat housing, resivoir and sending unit). It is suggested to do the rebuild at 100k and I agree. I had big issues with mine until I just did the whole shooting match (online parts ~$800 total), then worry free.

Last edited by sskloss; 06-15-2014 at 06:49 AM.
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Old 06-15-2014, 10:04 AM   #12
99e46bmw
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Originally Posted by sskloss View Post
You could have 'both' - a blockage/restriction and air in the system because of it. Since it took a while for it get hot and spew coolant from the cap, there could be a restriction somewhere that takes a while for its affect to show. Once it does you blow some coolant out, which is replaced by air, which then creates its own problems adding to the first.

At 200k miles you should have rebuilt the entire system (radiator, hoses, thermostat, thermostat housing, resivoir and sending unit). It is suggested to do the rebuild at 100k and I agree. I had big issues with mine until I just did the whole shooting match (online parts ~$800 total), then worry free.

I haven't had the car long.. Maybe a few months. Water pump is new, thermostat aswell, because i did those myself... What i don't understand is, last month before i changed the t-stat, it hasnt done it since, until now..

That pin-hole in the water return would cause the overheating/pressure build up like that? It's hard for me to believe. Once i get it fixed im selling it, ill never own another, i have had more trouble out of this car than any i have ever owned in my life,lol.......
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Old 06-15-2014, 06:15 PM   #13
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Maybe head gasket

With compression number that far off, it could be a head gasket leak.

Fix you water pipe leak and then see if it still overheats.
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