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Old 10-18-2010, 06:52 AM   #1
fitter527
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radiator help needed

http://www.realoem.com/bmw/showparts...40&hg=17&fg=05
i replaced my rad yesterdayand now i have a leak somewhere between #10 and the radiator.i've had the rad apart three times now and still cant find out where it is coming from.i really don't think it's the expansion tank.does anyone have any ideas?
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Old 10-18-2010, 07:26 AM   #2
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Quote:
Originally Posted by fitter527 View Post
http://www.realoem.com/bmw/showparts...40&hg=17&fg=05
i replaced my rad yesterdayand now i have a leak somewhere between #10 and the radiator.i've had the rad apart three times now and still cant find out where it is coming from.i really don't think it's the expansion tank.does anyone have any ideas?
why not? check all the clamps to make sure their tightened. expansion tanks have been known to go from my experience. you'll be able to see residue from the coolant left on any area leaking.
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I think I've had 14 bmw's in 4 years.
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2 325i 4 dr - sold
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1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 10-18-2010, 08:43 AM   #3
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is there supposed to be an o-ring on part #10 or is it 2?it shows one on an auto rad but doesn't show one for the manual?
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Old 10-18-2010, 09:03 AM   #4
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is there supposed to be an o-ring on part #10 or is it 2?it shows one on an auto rad but doesn't show one for the manual?
no 2 looks like a plug which would indicate a seal ring to go with it. isn't that the drain plug for the rad?
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 10-18-2010, 09:23 AM   #5
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http://www.realoem.com/bmw/showparts...41&hg=17&fg=05
this is the auto rad.#2 shows an o-ring.but it doesn"t show an o-ring for the manual rad.where #10 fits into the bottom of the radiator ,i was wondering if there is supposed to be an o-ring to make the seal into the socket?
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Old 10-18-2010, 09:52 AM   #6
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http://forum.e46fanatics.com/showthr...t=coolant+pics
on the 14th pic down it shows the mounting bracket for the expansion tank,right beside the word drain there is an opening and this is where the coolant is leaking from?it is open and goes right into the port on the bottom of the rad?seems strange.
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Old 10-18-2010, 10:23 AM   #7
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did you do the rad replacement or a shop? if you did, looks like you're going to have to go through everything. If that port matches the the drain from the rad then almost definite there is a o-ring. anywhere there are two joining parts in the cooling system there is either a clamp or o-ring to seal it from pressure. If it was a shop, bring it back have them fix it. They should have caught that. btw, just so you know....REALOEM isn't perfect and some diagrams aren't accurate. either is the EPC at the dealership. but from the link, I can see what you are looking at. The bracket has a port which slides into the rad and the drain part fits into the expansion tank. don't ask me why they designed this stupidly. But again, any joining parts should be sealed in some way.
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!

Last edited by Ceeker; 10-18-2010 at 10:27 AM.
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Old 10-18-2010, 11:18 AM   #8
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when i took that piece apart yesterday,there was no o-ring.i put an 0-ring in there and it is still leaking from that spot.i pulled the old rad apart to look at the internals,there is no way coolant should be coming out of there,but it is.
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Old 10-18-2010, 01:10 PM   #9
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0990l7a_19.jpg
does anyone know what these numbers mean?they are not part #s?
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Old 10-20-2010, 08:16 PM   #10
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turns out the guy sold me an automatic rad.i specifically asked if it was manual or auto.he told me manual.i hope he makes it right.
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Old 10-21-2010, 05:27 AM   #11
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auto or manual.. doesnt make a difference, all your doing for a manual car is plugging those automatic ports, heck you can just leave them open if you want. The rad is probably fine, did you bleed the system correctly? my experience with bmws is that cooling system is very finicky with bleeding. just my thoughts.
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Old 10-21-2010, 07:15 PM   #12
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E36is is right, bleeding an E46 properly is much more difficult than a conventional vehicle. I usually tend to changeover to de-ionized water in the summer with my other vehicles, but leave the 50/50 mix for my BMW's.
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Old 10-21-2010, 08:21 PM   #13
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Attachment 101038
does anyone know what these numbers mean?they are not part #s?
probably production numbers of where it was made, date etc.
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 10-21-2010, 08:41 PM   #14
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http://www.realoem.com/bmw/showparts...45&hg=17&fg=05
as you can see, #2 &3 are different.the automatic part is longer than the manual one.the manual adjusting screw has a hollow tobe that runs through the middle.the automatic is solid with a hole through the cross section.i used the one out of the original rad but the locking tabs broke during removal.so i had to use zipties and silicone to do a temporary fix.gotta love zipties.
i contacted the seller and he apologized. he has another one that is definatly from a manual because it is still on another car he is parting but much higher milage.he also offered to help me do the swap.
shitty thing is though i missed work on monday because this is my dd and i'm working in guelph.
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