Drain and Replace Coolant

Model [X] AON-M2 [X] AON-M2 2020
Category [X] Preventive [ ] Corrective [ ] Troubleshooting

Summary

The procedure that follows explains how to drain and replace the coolant in the cooling circuit.

Estimated time: 30 minutes

The coolant pump configurations differ between the AON-M2 2020 and the original AON-M2 model. Instructions for both configurations are located on this page:

AON-M2 2020 Instructions

Tools

Qty Description Specification
1 Screwdriver Flathead, large
1 Vacuum Pump, Manual N/A
1 Air Compressor 15 psi (maximum)
1 Tubing Rubber, 1/4 inch (6.4 mm) ID x 2 ft. (600 mm)
1 Bucket 3 liters minimum
A/R Rags Lint-free

Either compressed air or a manual vacuum pump can be used to drain the cooling circuit.

Parts Information

None required.

Personal Protective Equipment

Qty Description Specification
1 Safety Eyewear N/A
A/R Gloves Nitrile

Prepare The Machine

  1. Wait until the coolant is at room temperature.

    Allow coolant to reach room temperature prior to proceeding further. Failure to allow coolant to reach room temperature will result in thermal injury (burns) to personnel.

  2. Turn the power on with the ON/OFF switch found behind the machine.
  3. Place the 3-liter bucket directly under the radiator bleed valve found behind the machine.
  4. Use the large flathead screwdriver to remove the cap from the top of the coolant reservoir.
  5. With the pump turned on, use the large flathead screwdriver to open the bleed valve to let the coolant drain into the 3-liter bucket. Drain coolant using the bleed valve
  6. When the coolant reservoir is nearly empty, turn off the power with the ON/OFF switch found behind the machine.

    Do not operate the coolant pump when coolant level is low. This will damage components and void the AON3D warranty.

  7. Attach one end of the rubber tubing to the bleed valve and the other end into the 3-liter bucket. Attach tubing to the bleed valve.
  8. Place the hand vacuum pump or compressed air source against the opening at the top of the coolant reservoir. Force air into cooling circuit.

    Do not exceed 15 psi of compressed air. An excess of 15 psi will damage the cooling circuit.

  9. Carefully apply compressed air into the cooling circuit to push out the coolant that remains or use the manual vacuum pump in the pressurize mode. Do this until all the coolant has been drained from the cooling circuit.
  10. Remove the rubber tubing from the bleed valve.
  11. Use the large flathead screwdriver to close the bleed valve.
  12. Discard of used coolant in accordance to local laws and regulations.
  13. Fill the cooling circuit. Refer to Fill the Cooling Circuit.

AON-M2 Original Model Instructions

Tools

Qty Description Specification
1 Screwdriver Flathead, large
1 Vacuum Pump, Manual N/A
1 Air Compressor 15 psi (maximum)
1 Bucket 3 liters minimum
A/R Rags Lint-free

Either compressed air or a manual vacuum pump can be used to drain the cooling circuit.

Parts Information

None required.

Personal Protective Equipment

Qty Description Specification
1 Safety Eyewear N/A
A/R Gloves Nitrile

Prepare The Machine

  1. Wait until the coolant is at room temperature.

    Allow coolant to reach room temperature prior to proceeding further. Failure to allow coolant to reach room temperature will result in thermal injury (burns) to personnel.

  2. Turn the power on with the ON/OFF switch found behind the machine.
  3. Place the 3-liter bucket directly under the radiator located at the back of the machine. Position a bucket to catch the draining coolant.
  4. Use the large flathead screwdriver to remove the plug on the coolant reservoir. Remove the black cap.
  5. Place a lint-free rag under the right quick-connect fitting to absorb the coolant that may exit the quick-connect fitting.
  6. Disconnect the coolant tube from the right quick-connect by pressing on the green collar and carefully pull the grey connector.
  7. Place the coolant tube into the 3-liter bucket. Let the coolant drain into the 3-liter bucket. Remove the coolant drain tube.
  8. Place the manual vacuum pump or compressed air source against the green collar of the right quick-connect fitting.

    Do not exceed 15 psi of compressed air. An excess of 15 psi will damage the cooling circuit.

  9. Carefully apply compressed air into the cooling circuit to push out the coolant that remains or use the manual vacuum pump in the pressurize mode. Do this until all the coolant has been drained from the cooling circuit.
  10. Reconnect the coolant tube onto the right quick-connect fitting. Make sure the coolant tube is correctly attached to the quick-connect fitting.

    Do not operate coolant pumps when coolant level is low. This will damage components and void the AON3D warranty.

  11. Discard of used coolant in accordance to local laws and regulations.
  12. Fill the cooling circuit. Refer to Fill the Cooling Circuit.

Last modified: July 8, 2021