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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-14-2011, 02:56 PM   #21
OrientBlau
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Quote:
Originally Posted by BimmersGarage View Post
OEM
For guarantee fitment (it just fits, no fighting with it to get it installed) and reliable functionality (coolant level sensor)

Yes, you've heard/read that the original ET do fail/crack/explode BUT that's usually after 5 years or 85+K miles whichever comes first.
My factory ET lasted 9 years.
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Old 06-14-2011, 03:07 PM   #22
Chris C
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My factory one lasted 180K miles before failing. I got another OE one. Good luck.
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Old 06-14-2011, 04:35 PM   #23
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I replaced my first one at 100k miles and purchased it from AutohausAZ. It wasn't OE and I paid the price as it ruptured within aabout 20k miles. The next one came from Tischer BMW so it's OE. Still going 45k miles later. All that to say, go OE only!
That's what I needed to hear !

I just ordered a gallon of coolant and an OEM expansion tank from oembimmerparts.com , cost $100 with shipping. Dealer didn't ask for much more, just $86 for tank and $22 for coolant + tax ($118 total). but Im in no mode to donate $18. hope it gets here before the weekend, I can't wait to fix this annoying issue.
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Old 06-20-2011, 12:29 PM   #24
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OEM Expansion Tank installed ! Everything is A-OK ! But my coolant vent screw broke ! ... Thanks guys !
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Old 06-20-2011, 12:35 PM   #25
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I didn't buy a BMW expecting to treat it like a Mazda. I just wanted to know if there's an upgrade from the OEM with regards to the expansion tank. I don't wish to replace the OEM tank twice.

I guess OEM it is then. Thanks for the feedback everybody.
are you in salt lake?
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Old 06-20-2011, 01:02 PM   #26
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Hmmm, maybe I bought my coolant refresh kit too soon. Car has 150,000 miles, water pump (and probably expansion tank) were replaced at 75,000 miles by a previous owner. I haven't looked at the ET with a mirror to check its production date.
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Old 06-24-2011, 10:20 PM   #27
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Put in new ET last night, I think it's a Myele. New one made October 2010. Old one made sometime in 2007. Also put in new ET cap, MTC aluminum thermostat and fan switch sensor from ECS Tuning refresh kit, new upper and lower radiator hoses, new hose from ET to water pipe, and two new power steering hoses. I re-used my old coolant level sensor but am now thinking it might not be working because when I push the ET float all the way down and hold it there with a screwdriver, I don't get any coolant level warning lights.

Didn't change my water pump because supposedly last cooling system refresh put in an EMP Stewart pump. So I will be selling a new, unused Geba water pump.

The two coolant hoses I didn't change (and probably are originals) are the ones to the heater.
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Old 06-24-2011, 11:00 PM   #28
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Originally Posted by LivesNearCostco View Post
Put in new ET last night, I think it's a Myele. New one made October 2010. Old one made sometime in 2007. Also put in new ET cap, MTC aluminum thermostat and fan switch sensor from ECS Tuning refresh kit, new upper and lower radiator hoses, new hose from ET to water pipe, and two new power steering hoses. I re-used my old coolant level sensor but am now thinking it might not be working because when I push the ET float all the way down and hold it there with a screwdriver, I don't get any coolant level warning lights.

Didn't change my water pump because supposedly last cooling system refresh put in an EMP Stewart pump. So I will be selling a new, unused Geba water pump.

The two coolant hoses I didn't change (and probably are originals) are the ones to the heater.
The bobber (float) is only for your visual coolant level inspection. The electric one underneath the ET works independent and isn't touching any liquid.

BTW, in my opinion there is not much difference in the ET tanks. They don't blow up cause of who made them they blow up cause the aux fan relay most often fails and doesn't run at the correct high speed when the coolant is hot. The cap also fails as it should relieve any pressure before the tank explodes.

Last edited by BMW-North; 06-24-2011 at 11:04 PM.
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Old 07-04-2011, 04:04 PM   #29
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BMW-North: Thanks for the info. I knew the level sensor was electronic and didn't touch the liquid, but I assumed it detected when the upper float got too low. Does it directly sense the level of the fluid, or is there another bobber inside the ET? I think my Aux fan relay is working, but am not sure. Where is it, in case I want to replace it? Is it just one of the normal relays by the DME or by the passenger compartment fuses?

Tell me if I understand the aux (electric) fan process correctly. DME reads coolant temp from sensor in lower radiator hose. If DME thinks it's too hot, say above 95C (or you turn on A/C), DME turns on aux fan via a relay. If relay is bad, Aux fan runs on low speed instead of high speed?

My car overheated 3 days after replacing my ET in the middle of an AutoX run. Testing suggests the new MTC aluminum body thermostat got stuck shut. Plus after overheating, the heater circuit in the thermostat first threw a P0599 error then burned out with a loud "POP" and some smoke. I put the old thermostat back, added more coolant and rebled the system, and it appears the overheating problem is solved. But I won't know for sure until I can drive somewhere where I can rev the car up to 6000 RPM again, probably the next AutoX.
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Old 07-04-2011, 04:12 PM   #30
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Aluminum thermostats seem to be pretty bad according to the legend here.

Also, when I cut apart the ET I concluded that there's a magnet in bottom of the ET bobber...or metal, but the car might not bother to check for the level until it's warmed up or 'something' like that. I've heard and seen that the level sensors are sensitive. But, it's the same for windshield reservoir, so an easy swap if you want to test its function.

I doubt you 'need' to disconnect the battery first, but I generally do for most things beyond bulbs because I know I'm not an electronics genius!
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Old 07-05-2011, 04:05 PM   #31
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are you in salt lake?
I'm actually in Orem, but I drive up to SLC all the time ...
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Old 07-05-2011, 04:21 PM   #32
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All same
Go cheap, < $40
http://www.fcpgroton.com/product-exe...category_id/88
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Old 11-13-2012, 04:00 PM   #33
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Who make the OEM ET? Is it Behr, Meyle, or someone else?
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Old 11-13-2012, 04:06 PM   #34
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People claim it's Behr, but I've heard they've only just recently gotten into the market with them a year ago. Maybe they just started to produce generic, non-BMW versions of it. Every site I've been to claims the updated expansion tank is made by Behr.

Either way, that's the one I got. Looked and felt absolutely identical to the old one, fit perfectly.
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Old 11-13-2012, 04:07 PM   #35
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this is a dead topic.. behr is oem but its now made in China which apparently has some issues compared to OE bmw. had both in my hands and couldn't tell the difference aside from OE being slightly lighter in the light.

use OE.

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Last edited by pawelgawel; 11-13-2012 at 04:08 PM.
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