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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 09-25-2013, 01:05 PM   #1521
BaliDawg
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trans oil quick disconnect

Quote:
Originally Posted by djbradle View Post
Maybe the only in/out are the inlet and outlet cooling line quick connectors?
There are lots of places to drain the coolant: block drain plug, radiator drain plug, lower radiator hose, auto trans oil cooler. Disconnect all these for an optimal drain.

Those quick disconnects from the auto trans oil cooler will spill trans fluid, not drain coolant. You know that, right?

Also, be aware that once you open the cooling system you have committed yourself to the infamous coolant bleeding procedure.

Finally, if you are going to work on the cooling system then follow Mango's advice and completely replace everything that is aged and suspect. It's not that costly and will save you thousands from a blown head gasket. As me how I know...
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Old 09-25-2013, 04:40 PM   #1522
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Originally Posted by BaliDawg View Post
There are lots of places to drain the coolant: block drain plug, radiator drain plug, lower radiator hose, auto trans oil cooler. Disconnect all these for an optimal drain.

Those quick disconnects from the auto trans oil cooler will spill trans fluid, not drain coolant. You know that, right?

Also, be aware that once you open the cooling system you have committed yourself to the infamous coolant bleeding procedure.

Finally, if you are going to work on the cooling system then follow Mango's advice and completely replace everything that is aged and suspect. It's not that costly and will save you thousands from a blown head gasket. As me how I know...
Ahhh Okay. I didn't know that the tranny fluid flowed to the heat exchanger. I thought it was the other way around and that coolant flowed around the tranny somehow but I never ventured to seek out the facts on that. Thanks for the correction! It is obvious know that my former opinion would never be a viable choice for tranny fluid cooling, ha!
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Old 09-25-2013, 05:14 PM   #1523
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Make sure you replace your trans cooler o-rings if you disconnect it
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Old 09-26-2013, 11:27 PM   #1524
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I know it was put there for a reason, but is it possible to run without the auto trans coolant thermostat? What would be the consequences of deleting it?
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Old 09-27-2013, 12:05 AM   #1525
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Mango should probably have the final word on that question, but I can confirm that I removed it six months ago without issue. I believe it's there to preheat the trans fluid thereby reducing trans wear. It is really fragile (I broke mine during a cooling system overhaul) and restricts the coolant flow a bit.
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Old 09-27-2013, 12:13 AM   #1526
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I know it was put there for a reason, but is it possible to run without the auto trans coolant thermostat? What would be the consequences of deleting it?
I ran mine without for quite some time while i waited for parts and time to put it in. Ran perfectly fine.
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Old 09-27-2013, 01:35 AM   #1527
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I'm no expert on the auto trans, but common sense tells me BMW put it there for a reason. You don't want the fluid too cold. Without it, seems the trans fluid would be over-cooled.
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Old 09-29-2013, 01:53 PM   #1528
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Expansion Tank Mounting Question

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Sure, I can add the mounting plate. In my experience, it's a robust part and is essentially just a plastic frame. should be fine if you're careful. I'll add it!

Since this part isn't a typical failure item, I didn't include it in the grand totals. It's $54 and somewhat substantially drives up the cost of the rebuild.
New to forums. Have read a lot about coolant leaks and expansion tank. Had a slow leak at the temperature sensor. It finally got big enough that I had to attend to it. There was indication of leakage at the top of the expansion tank and I fought my way through removing it. When I looked from the bottom after removing it, I saw that the mounting plate seems to be loose from the radiator, but not sure how it is supposed to look. Any thoughts on the questions on the photo would be appreciated.

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Old 09-30-2013, 08:41 AM   #1529
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* E46 Cooling Guide (Information w/parts list/bleeding) *

Thanks for the confirmation Mango and BaliDawg


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Old 10-05-2013, 09:08 AM   #1530
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Hey guys,

I have tried to search but haven't found the info I need, I have a 2003 E46 320i AUTO and am looking to buy a radiator, will this part fit? part # 17 11 9 071 519?

Is there a forum or thread with part numbers to look up so you can confirm they fit for specific models?

Thanks for you help in advance
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Old 10-05-2013, 11:31 AM   #1531
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Use your vin at www.realoem.com
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Old 10-08-2013, 05:10 AM   #1532
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* E46 Cooling Guide (Information w/parts list/bleeding) *

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Use your vin at www.realoem.com
Thanks Stinger9!


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Old 10-09-2013, 05:16 AM   #1533
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Glad to help. There's also other misc. hard pipes and even one soft hose which connects to back of expansion tank and goes to the hard cooling pipe towards the firewall. But nobody replaces that but maybe I should add that too. I totally forgot about it when I did my cooling update. But, FWIW, I don't think I've ever heard of a hose failure on these cars.
once again my friend you never sieze to amaze me i shall be doing an oil change and chaging my coolant/antifreeze with some distilled water this weekend and of course i shall be using your DIY guide to do this well need maintance i know the PO didnt do
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Old 10-09-2013, 07:21 AM   #1534
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once again my friend you never sieze to amaze me i shall be doing an oil change and chaging my coolant/antifreeze with some distilled water this weekend and of course i shall be using your DIY guide to do this well need maintance i know the PO didnt do
Don't follow Mango's cooling system guide!

Far better to drive along obliviously until something needs replacing. You get to experience the thrill of waiting by the side of the road in freezing rain or in a really bad neighborhood, till the tow truck get there.

As an added bonus, you get to buy a complete engine instead of a few measly parts.

I'm sick of following Mango's advice! I have been doing that for a while now and I have not had any excitement.
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Old 10-09-2013, 07:34 AM   #1535
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Don't follow Mango's cooling system guide!

Far better to drive along obliviously until something needs replacing. You get to experience the thrill of waiting by the side of the road in freezing rain or in a really bad neighborhood, till the tow truck get there.

As an added bonus, you get to buy a complete engine instead of a few measly parts.

I'm sick of following Mango's advice! I have been doing that for a while now and I have not had any excitement.
how about no thanks man im not going to just let my car die on me or let the engine overheat making me spends more money than i have to And 1. im already due for an oil change and my low coolant/antifreeze light (or w.e you want to call it) JUST turned on on my way to work last night so im doing it! and 2. he already gave me advice on how to change my fuel pump and everthing went great so as of now i have no reason not to follow his diy guides
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Old 10-09-2013, 09:11 PM   #1536
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He's just messing with you..... we all know maintenance is priority. Unless you like to push your luck and don't care.
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Old 10-09-2013, 09:50 PM   #1537
Lynchy
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He's just messing with you..... we all know maintenance is priority. Unless you like to push your luck and don't care.
Good haha maintaince over everything
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Old 10-18-2013, 10:24 PM   #1538
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rad light comes on when heater is turned on and gos off when heater is turned off

What's the deal I'm a mechanic and I bought the car for my wife on our 25th anniversary 2005 325i she wants to keep it forever
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Old 10-20-2013, 10:15 PM   #1539
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What's the deal I'm a mechanic and I bought the car for my wife on our 25th anniversary 2005 325i she wants to keep it forever
Needs coolant....
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Old 10-21-2013, 08:38 AM   #1540
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I have everything removed, and am going to order the replacement parts today. What hoses are normally replaced? I know Upper and Lower, but what about the two smaller hoses that come off the bottom of the expansion tank and mount? - I think they go to the heater core, correct? Do these need to be replaced? I worry about 12 year old rubber o-rings on those connections. Can you replace the o-ring?
Thanks!

Last edited by SDL; 10-21-2013 at 08:52 AM. Reason: spelling
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