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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 05-21-2012, 01:53 PM   #261
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I'd say that link is pretty good. The bleeding part is a bit basic though but follow both and you should be fine. It almost implies that you're done as soon as water comes out of the bleed hole. The system will take a while to "gulp" all the water down. But the bucket is a good idea. You at least have a sense of when your system is filled to capacity
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Old 05-21-2012, 02:25 PM   #262
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Why is the expansion tank mounting plate considerd optional?
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Old 05-21-2012, 02:26 PM   #263
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Because it usually survives the taking apart of the cooling system. I've done both my brother's auto and my manual car. And on both occasions the mounting plate survived the transfer over to the new radiator.
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Old 05-21-2012, 02:46 PM   #264
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Ohhhh noooooo Finnish work get to the car park and there's a puddle under my car, turned out to be the coolant for some reason the fans not coming on and the pressure is blowing the lid off the tank. It seems like the water is not circulating round to the radiator. The hose leading to the thermostat doesn't seem to be getting hot as much as the others anyway. I don't know much about cars as most you so this might not be clear. If you have any idea what I'm talking about and how to resolve this please let me know
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Old 05-21-2012, 03:07 PM   #265
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Quote:
Originally Posted by 330CSL View Post
Why is the expansion tank mounting plate considerd optional?
+1 what Moiz said. It's just a piece of plastic that locates the expansion tank and is quite expensive. If it breaks upon removal, you can always buy a new one. Or if you're that worried, buy it when you buy the other cooling parts, and return it if you don't need.
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Old 05-21-2012, 03:56 PM   #266
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Quote:
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Why is the expansion tank mounting plate considerd optional?
If you do keep it, at least change the O ring on the back of it. Never re use O rings.
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Old 05-22-2012, 01:42 PM   #267
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I got my car a year ago, Auto 325ci, 2002 138Kmiles.. did VCG, flushed/fill up coolant, replace fcabs and updated a few other things.. fluids, internal/blower motor resistor etc.. . Car is running great and no issues.

The question is by looking at the components, how do I know if the cooling system was already done or not?

anything to look?
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Old 05-22-2012, 02:18 PM   #268
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You don't really know. You can simply look at the parts and make your best judgment call. Some parts like the radiator and expansion tank have a date stamp/tag on it. Check it out.
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Old 05-22-2012, 02:25 PM   #269
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Thanks for this awesome info Mango! It saved my engine and when my cooling system went down, I knew exactly what parts to replace and what to replace them with. Cooling system will be good to go for the entire time I plan on owning the car
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Old 05-25-2012, 10:26 PM   #270
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This will be my first complete cooling overhaul.
One question on the radiator from Behr.
The bottom drain hole appears factory sealed.
In other words it looks like it should be knocked out.
Can this remain closed until the next flush ?
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Old 05-25-2012, 10:46 PM   #271
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On the bottom of the Behr there should be a drain that can be opened.
It would be necessary to open this for a coolant draining.

Can you describe what you refer to in more detail?
Or better yet, take a pic for us?
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Old 05-25-2012, 11:06 PM   #272
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Correct. What stinger said. It looks sealed but its not. It comes off.
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Old 05-25-2012, 11:11 PM   #273
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I got the new Rad today.
I was surprised the bottom drain hole
didn't have a blue screw ( but easy to use the old one)
I was also surprised the hole was not open

Would you install the blue screw now
Or can I wait, leaving the plastic sealed

Hope I'm making sense
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Old 05-25-2012, 11:13 PM   #274
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Okay sealed is not the best word
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Old 05-25-2012, 11:13 PM   #275
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Take a picture of what you're talking about. Not sure I understand
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Old 05-28-2012, 06:33 PM   #276
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Successfully completed the cooling system overhaul over the weekend. Thanks for the info.

Most parts were in decent shape except the pulleys which were pretty much dry and noisy. Eventually it had to be done.. so i am happy i got this out of the way.

Everything went super smooth except that i am not too happy with the stewart pump performance. I had the impression the temperature needle would lean a tab to the left but it's sitting right on the middle like it used to before.
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Old 05-28-2012, 07:01 PM   #277
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Temperature is not controlled by the pump, but the thermostat via the ECM. The Stewart only provides the excess capacity to cool more if extreme weather or duty requires this.
So relax.

And your gauge is not analogue, so you would not have seen an accurate reflection of the temperature even if the pump had lowered the operating temperature a bit.

And your engine is designed to operate at a specific temperature for many reasons. Everything runs right here. BMW could have adjusted the operating temperature lower if they wanted to, but didn't.
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Old 05-28-2012, 09:38 PM   #278
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Temperature is not controlled by the pump, but the thermostat via the ECM. The Stewart only provides the excess capacity to cool more if extreme weather or duty requires this.
So relax.

And your gauge is not analogue, so you would not have seen an accurate reflection of the temperature even if the pump had lowered the operating temperature a bit.

And your engine is designed to operate at a specific temperature for many reasons. Everything runs right here. BMW could have adjusted the operating temperature lower if they wanted to, but didn't.
yes yes.. no need to give me the noob speech lol. i expected "noticeable" results with the stewart pump like most claim. That is all.

Good points though for someone that doesn't know those things.
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Old 05-28-2012, 10:34 PM   #279
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No intent to offend. Just figure to get it all out because others read here too.

Had the S pump on for years now and temp needle stays rock steady straight up even when driving in stop and go traffic in 115 degree weather.
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Old 05-29-2012, 02:23 PM   #280
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Behr radiator won't fit?

Hi guys -

I have a 2004 330xi Auto. I have been struggling to mount a new Behr radiator since 6+ hours now. It looks like it fit in nicely but one of the holes does not line up (see the attached pic). It appears to be a snug fit otherwise. It does not wiggle at all. I have removed and installed the radiator over and over again with the same end result and I am afraid I might cause stress fracture in the hoses that hook up to the back of the engine block.

I ordered it from BMA Auto parts based on Mango's parts list. The packing slip has the correct part number: 17119071519.

Any ideas what I can do here? I called the local stealerships here and no one has a radiator in stock. The dealers in the Pittsburgh area suck real bad, couple of them did not even have the engine oil drain plug in stock last week

If anyone has any experience with this can you please help?

Thanks.
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