WIS 20.20 Radiator, Coolant Hoses

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Back to WIS 20 Engine Cooling System

Description - Radiator

TBD

Description - Coolant Hoses

These are the Hot Water lines in a S500 M113 engine.

Part Numbers - Coolant Hoses

  • #10 A220 832 17 94 Hose from engine to connecting tube.
  • #20 A220 832 00 15 Pipeline: feed thru partition panel with option 875 (heated screen washing system).
  • #25 A220 832 01 15 Pipeline: feed thru partition panel with options 228/490/582 (auxiliary heater, elimination windshield heating, air conditioner in rear).
  • #25 A220 832 01 15 Pipeline: feed thru partition panel.
  • #30 A220 832 01 94 Hose from connecting tube to heat exchanger with option 228 (auxiliary heater).
  • #30 A220 832 01 94 Hose from connecting tube to heat exchanger.
  • #170 A220 832 09 94 Hose feed pane washer water heating.
  • #170 A220 832 09 94 Hose feed pane washer water heating with option 582+875 (air conditioning in the rear, heated screen washing system).

Issues - Coolant Hoses

Leak in Pipeline feed thru partition panel

A common fault with the Hot Water Lines is a slight coolant leak caused by a small crack in the #25 Pipeline: feed thru partition panel.

The feed thru pipe is made of plastic and must get brittle with age and heat and develops a slight split or crack.

And with thanks to BenzWorld Member 'SChalmers' here is the location for the #25 Pipeline: feed thru partition panel. It seems to be the same for both RHD and LHD cars.

The diameter of the feed thru pipe is 20mm and some enthusiasts have fashioned a replacement using copper pipe and a 45 degree elbow.

However a genuine M-B replacement part is about $30.

DIY Replacement for Pipeline feed thru partition panel

With thanks to BenzWorld Member 'pinkster' the Pipeline feed thru partition panel is locked into the fake firewall panel with tabs.

However to get to the heater hose clamp inside the fake firewall area requires removing the windscreen wipers, then the plastic cover below the windscreen wipers, and this can be rather difficult to fully release without doing some damage.

One technique is to undo the four plastic screw/rivets and then carefully prise up the panel starting from one end with a wide spatula type tool levering in a direction normal or away from the glass windscreen. The panel is held in place by a 10mm strip which is a friction fit into a groove in the channel at the bottom of the windscreen.

Then on a RHD car remove the ACC air intake chamber.

Open the drain valve under the radiator and catch the coolant in a clean container of at least 10L capacity.

Release the hose clamps on either side of the feed thru pipe.

Release the feed thru pipe by twisting it a few degrees clockwise looking from the front and then remove it by pulling it towards the engine bay.

Installation of the replacement feed thru pipe is the reverse of the above.

Filter the recycled coolant into a suitable clean container and then reintroduce into the cooling system using a vacuum refiller to eliminate any trapped air. For the vacuum method see WIS 20.00 General.

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