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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 03-19-2017, 01:38 PM   #1
Dave1027
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New E46 Coolant Bleed Process

I recently replaced my leaking expansion tank and had seen a short youtube clip of the bleed process being done with the engine running. The clip also showed the use of a piece of clear tubing ran from the bleed hole back to the filler neck. I thought it looked like it could be better than the common method. I decided to make this video of the process. It was a resounding success.

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Old 03-19-2017, 04:26 PM   #2
Infamousredrum
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Did you run the hose all the way into the bottom of the fillneck until its submerged? And at the end after no air bubbles should there be a steady stream of coolant running thru bleeder hose? Or was nothing coming through couldnt tell
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Old 03-19-2017, 04:37 PM   #3
Dave1027
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The hose end was only sticking into the neck, not submerged. It does not need to be submerged. The flow is from the bleed hole.

At the end it was a steady stream of coolant and no air in it.

One thing to note that I did not put into the video was towards the end I did rev up the motor a little to help dislodge the air bubble in the heater core. I reved it to 2k or so a few times
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Old 03-19-2017, 06:25 PM   #4
Infamousredrum
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Been having over heating problems an fifteen mins into idling there is still a constant flow of bubbles coming up the tube yet a block vapor test doesnt turn yellow or green indicating exhaust gases an no milky oil an compression test is good... Only torqued head bolts an extra qtr turn tho not half turn cuz i know my block is soft... Do you think the bubbles are likely a leaky heater core or likely exhaust gases because it idles fine overheats only when driven im at my wits end here an dunno what i should do at this point entire cooling system has been replaced... An engine rebuilt i had a cracked cylinder head... Pressure test shows good on cooling system up to 20psi holds fine.... Yet heater was off during this so water valve was prob closed an dunno if pressure test would reveal leaky heater core via return hose... Also heater blows warm yet only blows hot when revving the engine
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Old 03-20-2017, 11:07 AM   #5
Dave1027
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Quote:
Originally Posted by Infamousredrum View Post
Do you think the bubbles are likely a leaky heater core or likely exhaust gases because it idles fine overheats only when driven
I'd run it till the aux fan comes on, reving the engine a few times to dislodge any trapped air. If the air bubbles never quit I think that indicates a head issue.
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