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Old 04-14-2012, 05:54 AM   #1
punkdu
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Question Expansion Tank

Hey All!

My 325i with about 108,000 miles on it has a problem. When I check the coolant level when the engine is cold it almost looks empty, I then fill it up until the level is filled to the max. After Driving the car to work and parking it leaks massive coolant during cool down. I then return to the car after work and the expansion tank is low again. If I don't refill it to the maximum level nothing leaks but I am afraid I am running on low coolant. Any ideas?
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Old 04-14-2012, 06:05 AM   #2
dmax
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You shouldn't see coolant really...you should fill so the balls on the dipstick straddle the top of the filler neck. Sounds like you're overfilling it. There's no mark for overfilling...once the stick is up all the way, could add another 2 cups by mistake and you wouldn't know you've overfilled it...unless you look at the graphic on the plastic piece to the right of the ET cap.

Fill to between min and max levels.

Did you get a low coolant light? If not, you just overfilled, risked cracking your ET...so you should monitor the level for a few days to make sure you're not really leaking from other than just the cap.

Read more cooling threads...like the stickied one above.

GL...hth
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Old 04-14-2012, 06:08 AM   #3
IxNay
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The problem is that you are driving to work (j/k, don't you wish you didn't have to?). Maybe you are filling it a little too high. When you fill it do you let the indicator rise above the level of the opening? Max should only be about one inch above the opening. If you only fill it to the level of the opening and it does not leak then just don't overfill it from there. Also, try to see exactly where it is leaking from.
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Old 04-14-2012, 06:53 AM   #4
jfoj
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Check around the lower radiator hose for wetness or coolant.

The fan switch in the lower radiator hose is famous for slowly leaking coolant and usually it will accumulate on the top of the engine bay under cover and not often drip on the ground.

If you find any wetness in this area or directly below on the engine under cover, purchase the $3 O-ring listed below in my signature.
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Old 04-14-2012, 09:46 AM   #5
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Quote:
Originally Posted by jfoj View Post
Check around the lower radiator hose for wetness or coolant.

The fan switch in the lower radiator hose is famous for slowly leaking coolant and usually it will accumulate on the top of the engine bay under cover and not often drip on the ground.

If you find any wetness in this area or directly below on the engine under cover, purchase the $3 O-ring listed below in my signature.
$1 from pelicanparts.com.... Its the same o ring as the air intake sensor. Hth
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