Bleeding air out from coolant
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Joined: Jul 2003
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From: North Scottsdale, AZ
'71 Pinto
AR20.00-P-1142EWS Drain/Fill In Coolant: https://workshop-manuals.com/mercede...res/page_3122/ + next pages.
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Joined: Apr 2003
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From: Northeast
2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic
I changed the coolant in my 2011 E350 (drain and fill) and never had to bleed it. I seem to recall reading somewhere that it was self bleeding. Either way, I kept a close eye on the coolant level and temp gauge for a couple days and no issues at all.
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From: Miami, FL
2003 CL 600
We never vacuum fill them at the shop and never have issues. I have seen only one case, and it came from another shop so I don't know the reason, but on a GLK with a M276 it had an air pocket trapped and would overheat randomly, we vacuum bled it several times and it went back to normal. But every other time I've seen or done personally any coolant service or cooling system repair, we fill them full, run the heater, let it warm up and open the thermostat, then top it off after it cools, and it's perfect.
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Joined: Nov 2016
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From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Interesting, but the WIS does NOT show using a vacuum bleeder for the M276. See attached.
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Joined: Aug 2004
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E550 Coupe 2wd (2016)
Usually cars self bleed, more or less. There are always problem spots so you need to rev the engine and maybe even drive it a bit to get all the air out. One I have, not MB, that to get the air out I need to drive up a very steep hill and rev it. All the other cars I've had I simply rev it to ~3500 while topping it off and I'm good to go. If there are any little bubbles hiding they'll come out with some driving.
The fill reservoir is designed to exchange air for water so it will self bleed as you drive. Just fill it with water, then rev it and check to see how much air is in it. Then drive it and check again. The more aggressive you drive the more air it'll get out, and faster, if any is left of course.
The fill reservoir is designed to exchange air for water so it will self bleed as you drive. Just fill it with water, then rev it and check to see how much air is in it. Then drive it and check again. The more aggressive you drive the more air it'll get out, and faster, if any is left of course.
