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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 07-06-2014, 08:42 PM
ncBeemer ncBeemer is offline
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Low coolant warning after water pump and T-stat install

I had a indy replace water pump and T-stat after the red engine overheat sign on my wife's '06 325i (has about 85K miles).
Everything was fine for a month and then I got low coolant warning, indy topped off coolant.
Now got a low coolant warning a second time a couple of weeks ago. This time indy checked for leaks, codes etc. and found nothing. So they topped off again.

Yesterday got the low coolant warning again. Any ideas as to what is causing this coolant loss? Any ideas for what to check etc.

Thanks,

Last edited by ncBeemer; 07-06-2014 at 08:44 PM.
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  #2  
Old 07-07-2014, 05:01 AM
fdriller9 fdriller9 is offline
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Did the Indy bleed the system after changing those parts?

It could just be air pockets being released and coolant filling those voids. However, you should have noticed this earlier.

If there are no visible leaks, it could be leaking internally and burning off in the exhaust. Ever smell a sweetish smell from the exhaust/white smoke?
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  #3  
Old 07-07-2014, 06:30 AM
hondo402000 hondo402000 is offline
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Quote:
Originally Posted by fdriller9 View Post
Did the Indy bleed the system after changing those parts?

It could just be air pockets being released and coolant filling those voids. However, you should have noticed this earlier.

If there are no visible leaks, it could be leaking internally and burning off in the exhaust. Ever smell a sweetish smell from the exhaust/white smoke?
well if the car overheated when the water pump went out, you could have warped the Head and its leaking into the combustion chamber, and yes as the poster said, you should be seeing steam coming from the exhaust, best way is to let someone drive the car and you follow and look for white steam coming from the exhaust

if you see it you got major problems
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Old 07-07-2014, 11:00 AM
CALWATERBOY DUE's Avatar
CALWATERBOY DUE CALWATERBOY DUE is offline
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Quote:
Originally Posted by hondo402000 View Post
well if the car overheated when the water pump went out, you could have warped the Head and its leaking into the combustion chamber, and yes as the poster said, you should be seeing steam coming from the exhaust, best way is to let someone drive the car and you follow and look for white steam coming from the exhaust

if you see it you got major problems

Maybe. Tiny leak takes awhile to 'exhaust' coolant....easily missed.

So, how to tell?

OP, how did Indy know water pump was out, or was that an assumption? Oops! You >could< be in for a head gasket. Bad news I know, but the truth will out! Combustion gas in coolant tested for?
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Old 07-07-2014, 03:03 PM
ncBeemer ncBeemer is offline
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Thanks folks for the replies. I'll check this out this evening.
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  #6  
Old 07-07-2014, 07:14 PM
sptt144 sptt144 is offline
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Leaking head gasket burns it through the cylinders and it magically disappears. Not good news. Could be a slow leak through a hose as well that you are not noticing (much better option). Good luck!
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Old 07-08-2014, 07:37 PM
ncBeemer ncBeemer is offline
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Checked the exhaust and no white smoke either at start-up or while being driven.
BTW, water pump and T-stat were replaced about 4 months ago. If there is a leak it is pretty slow.
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Old 07-08-2014, 08:06 PM
sptt144 sptt144 is offline
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Could it be as easy as the expansion tank cap?

http://www.bimmerfest.com/forums/sho...d.php?t=316730
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Old 07-09-2014, 08:43 PM
ncBeemer ncBeemer is offline
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Indy did a pressure test and found a leak at the radiator side tank.
While it doesn't appear to be a head gasket, need to replace the radiator... oh well!
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Old 07-09-2014, 09:47 PM
sptt144 sptt144 is offline
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Much better than a head gasket! Must have been burning off as it leaked.
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