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Mercedes W123 Radiator Hose Replacement

What you need

  1. Mercedes W123 Radiator Hose Replacement, Radiator Hose: step 1, image 1 of 1
    • Begin by draining your radiator of coolant as [invalid guide link]. You will not need to drain the block for this process.

    • As always, never work on your coolant system when it is hot. This is very very dangerous.

  2. Mercedes W123 Radiator Hose Replacement: step 2, image 1 of 2 Mercedes W123 Radiator Hose Replacement: step 2, image 2 of 2
    • Find your upper coolant hose connection at the upper driver's side of the radiator.

    • Loosen the hose clamp on this end of the hose.

  3. Mercedes W123 Radiator Hose Replacement: step 3, image 1 of 1
    • Follow this hose to the top of the engine block, where it enters the thermostat housing.

    • Loosen the hose clamp on this end of the hose.

  4. Mercedes W123 Radiator Hose Replacement: step 4, image 1 of 1
    • Then use a hose clamp removal hook or other appropriate tools to work around under the edge of the hose. This will help break them free; they often stick to the necks they attach to over time.

    • Pull the hose off fully on both ends.

  5. Mercedes W123 Radiator Hose Replacement: step 5, image 1 of 1
    • Continue by loosening the clamp on the lower radiator hose where it connects to the thermostat housing.

  6. Mercedes W123 Radiator Hose Replacement: step 6, image 1 of 1
    • Then go underneath the car and loosen the clamp on the lower radiator hose where it connects to the radiator.

    • Remove the hose in the same manner you did the upper hose.

    • Now replace both hoses, and secure with hose clamps. Replace the hose clamps with new ones if they were difficult to open due to corrosion or stripped screw heads.

    • Finish by filling the system with coolant and bleeding the system as [invalid guide link]

Nicolas Siemsen

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