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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 04-12-2012, 07:42 AM   #1
Kealbazor1
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Exclamation Coolant leak

I have been leaking coolant ever since i first bought my car (2000 e46 318i) coolant is leaking onto floor directly under heater behind engine. Currently needing to fill up about a litre every 2-3 days. Had it checked today and mechanic said i need a new plastic pipe or something that runs from the front of engine to the back of engine. Have to dismantle everything to see properly but havent done so yet. Wanting to know the name of that part and price please. And other questions and info will be great.
Thanks, Anthony
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Old 04-12-2012, 08:45 AM   #2
Akovski
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check out OEMparts.com they have plenty of diagrams for u
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Old 04-12-2012, 09:14 AM   #3
her01981
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Search ebay for BMW E46 Coolant Tank. It runs about $40
I had the same problem. I took it to my buddy, he took it out and sure enough there was a small crack on the side of it. Bought the part from ebay and he installed it. All good!
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Old 04-12-2012, 09:49 AM   #4
Kealbazor1
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On the cooling system diagram here it shows it as being called heater inlet pipee? Thats the only one looks like my description.

http://www.realoem.com/bmw/showparts...15&hg=17&fg=05
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Old 04-12-2012, 09:52 AM   #5
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Replace the whole cooling system. There's a great sticky on it, and it will save you headaches down the road.
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Old 04-12-2012, 10:02 AM   #6
Kealbazor1
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How much would that cost? I don't have money as yet and am selling the car just tryna repair stuff first
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Old 04-12-2012, 10:14 AM   #7
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Most likely option is the expansion tank (coolant tank), probably just a simple hair line crack on the side of the tank which is only leaks when hot water runs through. Get a compression test maybe?
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Old 04-12-2012, 10:18 AM   #8
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See sig. Do it. If not, light car on fire. thanks bro
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Old 04-12-2012, 11:38 AM   #9
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Based on what you are saying, you are correct. Your mechanic is describing the heater inlet pipe (number 8 on your drawing). You should replace the other plastic pipe (number 6) while you are in there, since it is accessible. You just need to order the pipes. They usually come with the o-rings already on them, so that can save you a few bucks. For both pipes, you should look at about $75US. It is just a matter of where you get the parts from and the shipping cost.
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