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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-17-2011, 10:45 AM   #1
nico de Jager
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Join Date: Oct 2011
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My Ride: 2000 318 BMW E46
Water loss

Hi there.
Who can help me. I have a 2000 318 BMW. I replaced the waterpump about a month ago and i find that i have to top up about a litre of fluid ever week and a half., Today i replaced the radiator cap to see if it may help.
What else could be my problem?
Thanx Nico
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Old 10-17-2011, 10:59 AM   #2
Jmarlowe330i
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the o-ring on the water pump sounds like it might be messed up or just not their...do you remember it?
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Old 10-17-2011, 11:30 AM   #3
Blocked Out
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Do you see any signs of leaks, or a visible leak somewhere?

Check your expansion tank and thermostat for leaks.
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Old 10-17-2011, 12:26 PM   #4
BMWCaptain
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Did this start to happen after your water pump replacement? If it did, then it could be the water pump or you may have disturbed the thermostat or other cooling system part. What was wrong with your water pump? Did you check your plastic water pipes in addition to the radiator hoses? How many miles on your car?
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