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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > Coolant dripping from bottom of expansion tank when cap removed?



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      09-06-2019, 10:31 AM   #1
MrSweet1991
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Coolant dripping from bottom of expansion tank when cap removed?

Hi All,

So I have a small coolant leak and today I decided to clean all the blue spots up from dried coolant, but I loosened the cap slightly and seen coolant dripping from the bottom of the tank. I screwed the cap back in place and looked all over the top of the expansion tank but it wasnt wet.. So I tested it again and it seemed to time right, as I loosened the cap and heard the pressure release coolant was dripping at the bottom.. But of course this would happen if coolant escaped out the side of the cap and ran down the expansion tank but I'm 99.9% sure there was no trace what so ever of coolant coming from the top. Is it possible that's Theres a small crack and unscrewing the coolant cap increases pressure? I need to let the phone charge to use the flash to see what the bottom looks like but was wondering if anything made sense?
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      09-09-2019, 02:27 AM   #2
rasa bmw
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quite common actually to have a cracked expansion tank,,,,well on older cars i mean like
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      09-09-2019, 03:47 PM   #3
Tambohamilton
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Doesn't the tank vent underneath, rather than burning your hand? I'm 90% certain it's just forcing a bit of coolant out of the vent when you loosen the cap. Are you doing it with the engine completely cold? It surprises me that there would be any pressure at all in the system, with a cold engine...
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      09-11-2019, 09:53 AM   #4
MrSweet1991
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Well peeps I figured out this Sorcery, it appears that there's a hole just besides the thread so that if coolant spills over it chucks it out the bottom.
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