WIS 20.20 Radiator, Coolant Hoses

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Description - Radiator

TBD

Description - Coolant Hoses

These are the Coolant Hoses including the Hot Water lines in a W220 M113 engine.

Part Numbers - Coolant Hoses

  • #10 A2208321794 or A 220 832 17 94 Hose from engine to connecting tube.
  • #20 A2208320015 or A 220 832 00 15 Pipeline: feed thru partition panel with option 875 (heated screen washing system).
  • #25 A2208320115 or A 220 832 01 15 Pipeline: feed thru partition panel with options 228/490/582 (auxiliary heater, elimination windshield heating, air conditioner in rear).
  • #25 A2208320115 or A 220 832 01 15 Pipeline: feed thru partition panel.
  • #30 A2208320194 or A 220 832 01 94 Hose from connecting tube to heat exchanger with option 228 (auxiliary heater).
  • #30 A2208320194 or A 220 832 01 94 Hose from connecting tube to heat exchanger.
  • #170 A2208320994 or A 220 832 09 94 Hose feed pane washer water heating.
  • #170 A2208320994 or A 220 832 09 94 Hose feed pane washer water heating with option 582+875 (air conditioning in the rear, heated screen washing system).

Issues - Radiator

For how to drain radiator and replace coolant see WIS 20.00 General.

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 #20 or #25 Pipeline: feed thru partition panel, depending on options fitted.

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

The issue can manifest itself by either, the low coolant warning light coming on, or smoke coming from the left front wheel area as the coolant sprays on the exhaust, or both.

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 US$11.

DIY Replacement for Pipeline feed thru partition panel

The Pipeline feed thru partition panel is locked into the fake firewall panel with tabs. It can be a pain to reinstall. Inserting the replacement is no problem, but it can stoutly resist rotating to the locked position so be careful to avoid breaking it. A close examination will show tiny ridges at the bottom of the slots on the locking tabs. If you are prepared to take the small risk and decide that there is no way that the fitting could ever rotate enough to be a problem with three hoses attached, then a minute or so with a small file will remove the ridges, and the fitting will turn easily to the locked position.

It is connected to a heater hose with a hose clamp inside the fake firewall chamber. Heater hose inside fake firewall chamber.

Firstly mark the position of the wiper blades on masking tape on the windscreen and the plastic panel. On some cars you may not have to mark the wiper positions, as there is a factory mark on the windshield near the end of the right wiper blade - a small, inconspicuous line in the black inner coating.

Remove the windscreen wipers. Note the wipers may be hard to remove. A small two-arm puller had them off quickly, with no damage. When replacing them add a small bit of anti-seize grease to make it easier next time.

Remove the plastic panel below the windscreen wipers. Note this can be rather difficult to fully release without doing some damage.

How to Remove Windscreen Wiper Panel/Guard

Plastic panel beneath windscreen wipers (RHD car).

One technique is to undo the four plastic screw/rivets and then carefully prise up the panel starting from one end with a wide plastic spatula type tool, levering in a direction normal or away from the glass windscreen. The panel is held in place by a 6mm 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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