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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 03-23-2015, 07:31 PM
Wayne738 Wayne738 is offline
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Location: roanoke, va
Join Date: Mar 2015
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Mein Auto: 2002 bmw 330i
Uuper radiator hose replaced on 330i still leaking

After I replaced the upper radiator hose on my 2002 330i BMW, the hose snapped in place, the clips snapped in place, the hose leaks at the radiator connection and the small reservoir connection. Need to know why it's still leaking?
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Old 03-24-2015, 01:59 PM
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tim330i tim330i is offline
Location: Boston
Join Date: Dec 2001
Posts: 7,697
Mein Auto: Ti Silver 03 M3
Welcome to Bimmerfest! I've moved your question to the E46 3 series forum, you will get more help in here. Did you replace the o-ring? Sounds like that might be the issue.

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Old 03-24-2015, 02:05 PM
Bigsean123 Bigsean123 is offline
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Join Date: Jun 2014
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Mein Auto:
Did you clean it before you replaced it and did it have new o rings in it?
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Old 03-25-2015, 05:04 AM
marcozandrini marcozandrini is offline
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Posts: 676
Mein Auto:
Does your car have the original radiator? Early E46 radiators tend to crack where the expansion tank and the radiator connect.
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Old 03-25-2015, 03:07 PM
SilberVogel SilberVogel is offline
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Location: Tulsa, OK
Join Date: Jul 2014
Posts: 274
Mein Auto: 2002 330Ci Conv.
To add to the above, what brand hose did you buy? Should have come with new o-rings; if not, here’s a thread with o-ring dimensions/part numbers: http://forum.e46fanatics.com/showthr...9#post14906529.

Would double-check hose fitment and use a small amount of lube to ensure the o-rings slide into place properly. As mentioned, also look into cracks on the radiator.

DIYs help you save money with repairs; let www.bmwpnpc.com help you save money with the parts.
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Old 03-26-2015, 09:39 AM
Caver Dave Caver Dave is online now
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Location: Foothills of NC
Join Date: Mar 2014
Posts: 113
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Mein Auto: 2004 330xi
Double DITTO!

Just did the cooling system refresh using the ECS Tuning kit... when comparing the ECS Tuning lower hose to another the PO (my brother) supplied, because the sensor was leaking so he bought both hose + sensor, it was missing both the o-rings!

So nobody misreads & calls for a lynching , the ECS Tuning components were top-shelf, correct & complete!
It was the lower hose of dubious unknown origin that was missing the o-rings... and still sitting on the shelf!
2004 Titanium Silver 330xi Auto @ 155k - *New* Bosch Alt (130k), G.A.S. DISA kit & 1.2bar Billet coolant cap, fuel filter (133k), Valve Cover Gasket (140k), VDO FuelPump (143k), Giubo & CSB (144k), Cooling System Refresh, CCV, OFHG (155k)
1972 Jeep Commando - AMC304 w/ TBI, TH400, Lifted, locked 4.27s, caged, bumpers, winch, 140A alt, OBA & airhorn... slightly modified for occasional offroad use
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