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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 09-14-2013, 07:39 AM   #1
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Join Date: Oct 2012
Location: Allentown, PA
Posts: 150
My Ride: 2002 325xi-sport pkg
is there a repair for old heater hose/fitting into new expansion tank?

I replaced the expansion tank, main hoses, water pump and thermostat. All new hoses I installed are fine with no leaks.

The heater hose (which I didn't replace) feels loose when connected to the new tank, and is dripping under pressure.

I need to use the car Monday AM so there's no way for me to get a heater hose between now and then.

Is there a way to repair these fittings like putting in a new O-ring? I searched the forum and googled but didn't really find a good solid wiki or post about it.

It feels awfully loose, is there a piece or o-ring that maybe fell out? (not that you'd know)... but can that happen?
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Old 09-14-2013, 12:44 PM   #2
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Join Date: Apr 2009
Location: Denver
Posts: 434
My Ride: 2003 330XI, 2003 M3
yes there is a o-ring, make sure you have the metal clip pull and you full insert the hose and press the clip down. Check your old tank
2003 LSB/BLK M3/SMG/Premium/Cold Weather/Nav

2003 AW/BLK 330XI/AT/Sport/Premium/Cold Weather
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Old 09-14-2013, 06:50 PM   #3
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Join Date: Oct 2012
Location: Allentown, PA
Posts: 150
My Ride: 2002 325xi-sport pkg
I fixed it. The hose ends are so simple I'm sorry for even asking.

I went down to the FLAS and they didn't have any O-rings the same size. While there I picked up a tube of Permatex Rubber gasket sealant

I cleaned the expansion tank and o-ring, then put some of that schmutz on both, put the o-ring in the fitting, schmutz'd it again, let them get tacky, then assembled and let it sit for an hour before filling. No leaks under pressure anymore. I'll update the thread if it starts leaking over time.

edit - 80 miles this morning and holding well so far.

Last edited by bikesandcars; 09-16-2013 at 07:18 AM.
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