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Old 03-03-2013, 10:38 AM   #21
BM-MAN
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Great Thread OP! I've been dealing with a coolant leak for months due to deformed 2" oring in expansion tank, finally bought a new tank last week. Only wish I found this thread sooner. Oh well.. bookmarked.
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Old 09-20-2013, 07:41 PM   #22
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Sorry for the resurrection

http://www.harborfreight.com/205-pie...kit-67644.html

So it would be awesome if someone could get a digital ID of the Air temp sensor o-ring. I have a package of these I bought awhile back and would like to replace the o-ring with one from this set but I don't really want to do a whole drain to find out the size or while coolant is pouring out through the temp sensor hole.
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Old 12-17-2013, 10:27 PM   #23
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Many thanks

Just wanted to thank all the posters for the information shared. I too had a progressive leak for about a month till it finally got too bad to continue driving. I replaced the bleed plug, cap, hose from water pipe on the side of the block to the expansion tank, o-rings for the trans cooler, and the water pipe assembly under the E.T. Still had a leak, then I read this post. Replaced both o-rings in the bottom of the E.T., and now no leak. Had I read this post earlier, could have saved some $$. I went down to my local Oreilly's and matched as best I could from their o-ring box, but will order the proper sizes and replace again, just to be safe.
Thanks again for the great post. ( I was about to order a new radiator...till I saw this thread!!)
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Old 12-27-2013, 07:14 PM   #24
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I've read this entire thread and didn't see the O-ring size for the E.T. cap (2 o-rings).

Did I just miss it or does anyone have the size?

I'm pretty sure mine are getting flat and allowing coolant to escape after I shut the engine off.

Thanks

Edit: I measured each o-ring and got the following: 1.16" o.d. bottom. 1.20" o.d. top.

No idea what the inside diameter would be.
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Last edited by swordsman11868; 12-27-2013 at 07:48 PM.
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Old 04-14-2014, 12:21 AM   #25
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What a great resource, thanks
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Old 06-14-2014, 08:42 AM   #26
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where can you find these? I tried Granger but couldn't seem to find any on the website with those specs

EDIT: CRAP i bumped old thread. apologies

Last edited by e46dub; 06-14-2014 at 09:01 AM.
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Old 11-03-2014, 01:06 PM   #27
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Could anyone give me a link for the Two ET o-Rings? I have a 318 will they fit the same? I also live in the UK so US website isnt any good
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Old 11-17-2014, 02:59 PM   #28
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Bump.

Ordered the McMaster Carr O-rings. Will update if it resolves my coolant leak.
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Old 11-17-2014, 08:28 PM   #29
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Never mind, they won't ship my order to Canada.. Bastards..

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Old 12-07-2014, 10:23 PM   #30
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Never mind, they won't ship my order to Canada.. Bastards..

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I ended up going to a local engineering firm and getting them custom made! Turns out it was the ET cap...
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Old 12-22-2014, 02:27 AM   #31
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bump.. does my local autoparts carry them (oreilly's autozone etc)? i just need the upper and lower o-ring since ill be changing my thermostat.
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Old 03-03-2015, 07:21 PM   #32
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Bumpity! Bump! Thanks to the OP and all the contributors. I wanted to replace my thermostat as preventative after 50k and wondered about how good the existing o-rings would hold up. So glad I came across this!
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Old 12-05-2015, 06:48 PM   #33
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Another bump... Replaced my radiator a couple months ago and no leaks at all from the radiator itself, but after a couple of weeks I got a small leak from the upper radiator hose so I replaced it with a new one. But now I have a much bigger leak from the heater hose (#5 in the realoem diagram) where it connects to the ET. That looks like a much tougher hose to replace, so I'd rather just get the o-ring. Besides, I might have to get an o-ring just to drive it to where I can replace the whole hose.

But I'm confused about one thing. Sellsellsell posted the links to bmp's 1.125" o-rings, and sdstevep posted 22mmx3. Those are different, so are these for different locations or something? I notice that the 22x3 is in one of those Harbor Freight kits. Has anyone tried that? Or for that matter, the 1.125" ones?

Also, this is OT to the thread, but wondering how hard that one hose is to replace. I searched but didn't find more than a few posts on those heater hoses.

Last edited by Chocolate Lab; 12-05-2015 at 06:51 PM.
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Old 12-07-2015, 03:24 AM   #34
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Quote:
Originally Posted by Chocolate Lab View Post
Sellsellsell posted the links to bmp's 1.125" o-rings, and sdstevep posted 22mmx3..
During my last coolant system refresh, I ordered 3 from bmpdesign as I wasn't sure the exact size neither:

Coolant Hose O-ring for 1.125" Fitting (115246)
Coolant Hose O-ring for 1.5" Fitting (115242)
Coolant Hose O-ring for 1" Fitting (115240)

Noticed the 1.125" refers to the hose fitting size, not the o-ring size.
All I can say is one of them fits.
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Old 12-07-2015, 10:16 AM   #35
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Thank you very much for the trouble you went to. This will save a lot of souls.
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Old 01-19-2016, 01:50 AM   #36
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Has anyone ever replaced the O-ring between the radiator and the expansion tank mount?
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Old 01-19-2016, 07:26 PM   #37
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Yes. I replaced the O-ring (17111711987, 14.5mm x 2.5mm) between the radiator and connecting plate when I replaced the expansion tank / connecting plate assembly along with two more of the same O-rings that seal the automatic transmission cooler to the connecting plate.
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Old 02-06-2016, 01:55 PM   #38
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Originally Posted by e46dub View Post
where can you find these? I tried Granger but couldn't seem to find any on the website with those specs

EDIT: CRAP i bumped old thread. apologies
The ORing store.

theoringstore.com
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Old 02-10-2016, 01:54 PM   #39
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Bumping this thread instead of starting a new one. I completely replaced my cooling system and I have a leak where the ET attaches to the ET bracket at the bottom where the thermostat sits inside. Could it be possible that I didn't get an O ring in that area and just didn't realize it? Has anyone else had the same issue? I replaced with all OEM parts. I have to take it apart anyway so I'm gonna order the O ring and see but just wanted to hear other's experience? I'll report back with my findings as well.
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Old 02-15-2016, 02:58 AM   #40
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Originally Posted by venerated View Post
Bumping this thread instead of starting a new one. I completely replaced my cooling system and I have a leak where the ET attaches to the ET bracket at the bottom where the thermostat sits inside. Could it be possible that I didn't get an O ring in that area and just didn't realize it? Has anyone else had the same issue? I replaced with all OEM parts. I have to take it apart anyway so I'm gonna order the O ring and see but just wanted to hear other's experience? I'll report back with my findings as well.
How bad is the leak? I would think if there were no o-ring in there it would be just pouring out.

I have a "cold/hot" leak from there. In other words - overnight when the car cools off - a tiny amount of coolant drips out - enough to leave a trail but not enough to need any added.
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