M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Steering Reservoir hose

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Old Oct 10, 2017 | 07:12 PM
  #1  
Kulle's Avatar
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2015 GLA45 AMG
Steering Reservoir hose

Hello,
Can anyone confirm that the hose circled in the picture, if disconnected at the cooler/radiator side will leak coolant if removed? i didnt think PS return hose connecting the reservoir side to the radiator had coolant passing through.

Thanks for any insight if anyone replaced that hose.

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Old Oct 11, 2017 | 01:10 AM
  #2  
Maj. Dundee's Avatar
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2002 ML 320 & 2006 ML500

That hose carries P/S fluid from the pump to the radiator, not coolant.
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Old Oct 17, 2017 | 11:15 AM
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bha
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That hose is definitely part of the steering system and will only leak P/S fluid not coolant as mentioned above.

Part of the radiator is used as a power steering cooler. It is separated from the coolant side completely -- the radiator hoses carry coolant to and from the radiator. Think of the radiator as two separate units built into one (radiator - coolant AND power steering cooler - P/S fluid)

If you remove that hose, most or all of your P/S fluid will leak out of the system. It is at the very bottom point of the system, so it will drain the reservoir, rack, and cooler entirely.

Having said that, the P/S fluid capacity of the system is very small (between 1 and 2 liters if I remember correctly). So the best thing to do is order extra P/S fluid, drain the entire system when removing that hose, then fill up with brand new fluid. Along with replacing the hose, you have basically done a flush (ok just drain and refill, but not too far off) of the system. This fluid gets old and gunky over time, so new fluid is a great thing to have.

I am planning to drain/refill my system soon by removing the bottom clamp (#160 in the picture above).
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Old Oct 18, 2017 | 10:26 AM
  #4  
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ok thanks !! that's exactly what I was thinking and my plan!
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Old Oct 26, 2017 | 05:47 PM
  #5  
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so i replaced the reservoir and return hose and filled with green pentosin fluid...havent seen any leaks...guess its fixed! weird because didnt see anything wrong with either part??? who knows
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Old Nov 17, 2017 | 07:32 AM
  #6  
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Kulle, you shouldn't use the GREEN antifreeze. You should be using YELLOW. Zerex G-05 should be a good alternative if your not using MB antifreeze.
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Old Jan 31, 2018 | 05:28 PM
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Originally Posted by Maj. Dundee

That hose carries P/S fluid from the pump to the radiator, not coolant.
Maj. Dundee, can you please post the part numbers for all hoses?


Last edited by Janumali; Jan 31, 2018 at 05:33 PM.
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Old Jan 31, 2018 | 05:33 PM
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Will this diagram also apply to 2006 ML350 Base?
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Old Feb 1, 2018 | 02:51 AM
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Please UPDATE YOUR PROFILE in USER CP to include where you live.

Also, post your full vin #.
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Old Feb 1, 2018 | 10:05 AM
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Thanks Maj. Dundee! My VIV is 4JGBB86E46A079451
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Old Feb 1, 2018 | 11:56 AM
  #11  
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Thanks for updating.

Here are the part numbers and a copy of your DATA Card.
Attached Files
File Type: pdf
Java Printing.pdf (47.7 KB, 149 views)
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Old Feb 1, 2018 | 06:40 PM
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Thank you very much, Maj. Dundee! Great help!
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