E-Class (W212) 2010 - 2016: E 350, E 550
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Upper radiator hose cold

Old Sep 13, 2022 | 12:51 PM
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2003 CLK500, 2008 e350
Upper radiator hose cold

Just did a coolanjt flush yesterday. Now the car overheats and the upper radiator hose (goes into the thermostat housing) is cold. Lower hose hot and fan turns on at high speed. Temp gauge goes to max. Everything was fine before the flush.

Any ideas????
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Old Sep 13, 2022 | 01:29 PM
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W212 MY'14 M276-3.5NA @75kMi
refill skill...

too much air... not enough coolant.

Right now your coolant is not circulating properly, that's causing overheat: STOP!

The question is: how do you fill the block to radiator circuit when the cap and overflow tank is located remotely ?

The key is to get the air bubbles to escape

I guess.... you want the coolant service procedure to burp all air pockets out.

Last edited by CaliBenzDriver; Sep 13, 2022 at 01:35 PM.
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Old Sep 13, 2022 | 03:59 PM
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2003 CLK500, 2008 e350
Originally Posted by CaliBenzDriver
too much air... not enough coolant.

Right now your coolant is not circulating properly, that's causing overheat: STOP!

The question is: how do you fill the block to radiator circuit when the cap and overflow tank is located remotely ?

The key is to get the air bubbles to escape

I guess.... you want the coolant service procedure to burp all air pockets out.
so you have the procedure? I wasn’t aware there was one

thanx
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Old Sep 13, 2022 | 04:05 PM
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W212 MY'14 M276-3.5NA @75kMi
coolant bleed on WIS

Originally Posted by rwolak
so you have the procedure?
I wasn’t aware there was one, thanx
submit your VIN# for a good soul to match your request.
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Old Sep 13, 2022 | 04:10 PM
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E350 Wagon
Here you go: W212 coolant flush
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