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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-19-2012, 05:01 PM   #1
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Join Date: Jul 2008
Location: USA
Posts: 5,788
My Ride: 2001 330Ci
Coolant Hose Connection

A little history: I replaced my car's radiator and expansion tank last spring as the odometer clicked over 100k miles. I bought both items (OEM) from one of the forum's sponsors. All went smoothly but the connection on the expansion tank mounting plate (see item #1 in http://www.realoem.com/bmw/showparts...40&hg=17&fg=05) was very tight. I thought the connection was fine.
Today: I checked the oil and coolant levels today. Oil was fine. Coolant recovery tank was EMPTY! Seems that the connection in the expansion tank mounting plate had come loose. Yes, there was a little coolant on the garage floor. So, I reconnected the hose, pushing it as hard as I could. I borrowed the wife's Honda so I could buy some BMW coolant and distilled water. I refilled the coolant and bled (and bled, and bled, and bled) the coolant system. All seems well.

So, you ask, why am I writing about this? Basically, I'm asking how far does that hose connection have to be so that the clip "clips"? In my case, the front of the hose connector is even with the tank mounting plate (please see the attached picture).
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Last edited by markusmarkus; 10-19-2012 at 05:14 PM.
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Old 10-20-2012, 02:44 PM   #2
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Join Date: Jul 2008
Location: USA
Posts: 5,788
My Ride: 2001 330Ci

I put the car on a lift and pulled the plastic underbody panel. I measured the distance from slot in the in the expansion tank mounting bracket male connector to the vertical tube on which the male connector is mounted (see the attached photo). It's exactly 1/2 inch. I then measured the distance between the groves in which the hose's female clip sit and vertical tube. 1/2". Success.
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