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Remove the Lenovo Neptune(TM) liquid assisted cooling module

Follow instructions in this section to remove the Liquid Assisted Cooling Module (LACM).


This task must be operated by trained technicians that are certified by Lenovo Service. Do no attempt to remove or install it without proper training and qualification.

About this task

Safety information for liquid detection sensor module cable
sharp edge
Sharp edges, corners, or joints nearby.
  • Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

  • Power off the server and disconnect all power cords for this task.

  • Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-sensitive components in their static-protective packages until installation, and handling these devices with an electrostatic-discharge wrist strap or other grounding systems.

  • If the server is installed in a rack, slide the server out on its rack slide rails to gain access to the top cover, or remove the server from the rack. See Remove the server from the rack.

Prepare the following screwdrivers to ensure you can install and remove the corresponding screws properly.
Torque screwdriver type listScrew Type
Torx T30 head screwdriverTorx T30 screw
Watch the procedure
  • A video of this procedure is available on YouTube.


  1. Remove the top cover. See Remove the top cover.
  2. Remove the system fan 5 from the fan module.

  3. Disconnect the pump 1 cable of the L2A module from the connector on the system board assembly. See Liquid assisted cooling module.
  4. Re-install the system fan 5 into the fan module.

    1. Align the four corners of the fan to fan module socket and put it down.
    2. Press the fan latch down to ensure that it is plugged in the connector.
  5. Disconnect the leak detection cable from the processor board, and route it out of the cable clips on the liquid detection sensor module holder.

  6. Re-install the handle to the LACM.

    1. Place the handle evenly on the LACM and align screw holes.
    2. Tighten the screws. Ensure that the screws are secured in place.
  7. Disengage the LACM from processors.

    1. Fully loosen the Torx T30 nuts on the cold plate assembly and radiator.
    2. Rotate the anti-tilt wire bails inward.
    3. Carefully lift the LACM from the processor sockets by the handle. If the LACM cannot be fully lifted out of the socket, further loosen the Torx T30 nuts and try lifting the LACM again.
  8. Place the LACM on the shipping tray.
  9. If there is any old thermal grease on the processors and the cold plates, gently clean the top of the processors and the cold plates with an alcohol cleaning pad.
After you finish

If you are instructed to return the component or optional device, follow all packaging instructions, and use any packaging materials for shipping that are supplied to you.