Fill the Cooling Circuit

Summary

The procedure that follows explains how to fill and bleed the cooling circuit.

Estimated time: 60 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 Bucket 3-liter capacity
1 Funnel Small
A/R Rags Lint-free

Parts Information

Qty Part Number Description
3 A46067D6 High-Performance Liquid Coolant, 700ml

Personal Protective Equipment

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

Preparation

The cooling circuit coolant capacity is approximately 1.5 liters.

Koolance bottle and tube

  1. Remove the cap from the coolant bottle to assemble the rubber spout onto the coolant bottle.
  2. Remove the rubber spout and set aside.
  3. Remove the plastic center cap. Do not discard the center cap as it can be reused to reseal the coolant bottle.
  4. Put the rubber spout upright onto the coolant bottle opening.
  5. Secure the rubber spout assembly onto the coolant bottle with the cap. Bottle Assembly

Fill and Bleed Cooling Circuit

Cooling system pump and radiator with labels Pour coolant into reservoir

  1. Separate the coolant pump wire harness connector (3) to turn the power the the coolant pump (5) off.
  2. Use the large flathead screwdriver to remove the filler plug (2).

    Carefully add coolant into the coolant reservoir (1) to not make air bubbles.

  3. Insert the funnel into the filler hole (2) to add coolant into the coolant reservoir (1).
  4. Fill the coolant reservoir (1) to one inch from the top.
  5. Place the empty 3-liter bucket directly under the radiator bleed valve (7).
  6. Connect the coolant pump wire harness connector (3) to turn on the coolant pump (5).
  7. Fill the coolant reservoir (1) to one inch from the top.
  8. Remove the cap located on the bleed valve (7).
  9. Install and tighten the cap onto the bleed valve (7) when coolant exits without air.

    Make sure bleed valve (7) cap is installed and tightened. A low coolant level will cause machine components to run too hot and void the AON3D warranty.

    Bleed any trapped air from the radiator
  10. Operate the coolant pump (5) for five minutes or until air bubbles are no longer present.
  11. Fill the coolant reservoir (1) to one inch from the top.
  12. Install the filler plug (2) onto the coolant reservoir (1) and tighten using the large flathead screwdriver.

AON-M2 Original Model Instructions

AON3D now uses a different coolant solution (now blue in color) from the one originally shipped with the AON-M2. We advise to switch coolants when performing the recommended maintenance coolant flush every 12 months. A thorough coolant flush is necessary when switching coolant types. See Drain & Replace Coolant.

Do not mix different types of coolant.

Tools

Qty Description Specification
1 Screwdriver Flathead, Large
1 Screwdriver Flathead, Small
1 Bucket 3-liter capacity
1 Funnel Small
A/R Rags Lint-free

Parts Information

Qty Part Number Description
3 A46067D6 High-Performance Liquid Coolant, 700ml

Personal Protective Equipment

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

Preparation

The cooling circuit coolant capacity is approximately 1.6 liters.

Koolance bottle and tube

  1. To assemble the rubber spout onto the coolant bottle, remove the cap from the coolant bottle.
  2. Remove the rubber spout and set aside.
  3. Remove the plastic center cap. Do not discard the center cap as it can be reused to reseal the coolant bottle.
  4. Put the rubber spout upright on the coolant bottle opening.
  5. Secure the rubber spout assembly onto the coolant bottle with the cap.
  6. Install the clear filler tube onto the rubber spout.

Coolant nozzle assembly with tube

Fill Cooling Circuit

Cooling Circuit Rear AON-M2

  1. Separate the coolant pump wire harness connector (6) to turn the two coolant pumps (3) power off.
  2. Use the large flathead screwdriver to remove the filler plug (2).

    Carefully add coolant into the coolant reservoir (1) to not make air bubbles.

  3. Add coolant into the coolant reservoir (1). Show pouring coolant
  4. Use the small flathead screwdriver to set both pump control dials (4) to speed 5. Show pump control dials
  5. Place a lint-free rag under the left coolant line (5).
  6. Remove the left quick-connect fitting located at the end of the coolant line (5) that enters the back of the machine: apply pressure to the green collar and carefully pull the gray connector.
  7. Connect the coolant pump wire harness connector (6) to turn the power on.

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

    The two coolant pumps (3) will make emit a strange sound when power is turned on due to air in the cooling circuit. Complete this fill cycle to resolve this.

  8. Once coolant exits the coolant tube (5), install the coolant tube to the quick-connect circuit fitting. Make sure coolant tube (5) is secure.
  9. Fill the coolant reservoir (1) to the top, install the filler plug (2) onto the coolant reservoir (1), and tighten with the large flathead screwdriver.
  10. Set the two coolant pump speed control dials (4) to speed 1.

Dislodge Trapped Air Bubbles

If difficulties arise to get full coolant circulation with the above-mentioned procedure, one or both of the methods that follow should help. Otherwise, continue to the next section.

Method 1

  1. With the two speed control dials (4) set to speed 5, cycle power on and off to the coolant pumps (3) several times. This procedure helps dislodge any air that clogs the cooling circuit.
  2. Fill the coolant reservoir (1) to the top.
  3. Install the filler plug (2) onto the coolant reservoir (1) and tighten with large flathead screwdriver.

Method 2

  1. Separate the coolant pump wire harness connector (6) to turn the power off.
  2. Place a lint-free rag under the right coolant line (5).
  3. Remove the right quick-connect fitting located at the end of the right coolant line (5) that enters the back of the machine: apply pressure to the green collar and carefully pull the gray connector.
  4. Connect the coolant pump wire harness connector (6) to turn the power on.
  5. Once coolant exits the coolant tube (5), install the right coolant tube (5) into the right quick-connect circuit fitting. Make sure coolant tube is secure.
  6. Fill the coolant reservoir (1) to the top.
  7. Install the filler plug (2) onto the coolant reservoir (1) and tighten with large flathead screwdriver.

Eliminate Remaining Air Bubbles

  1. Remove the filler plug (2) from the coolant reservoir (1) with large flathead screwdriver.
  2. Decrease the two coolant pump speed control dials (4) to speed 1. The flow should become consistent and free of any air bubbles. Add coolant as necessary to keep the coolant reservoir (1) full.
  3. Increase the right cooling pump speed control dial (4) to speed 2. Wait until the air bubbles have finished getting to the coolant reservoir (1). Add coolant as necessary to keep the coolant reservoir (1) full.
  4. Increase the left cooling pump speed control dial (4) to speed 2. Wait until the air bubbles have finished getting to the coolant reservoir (1). Add coolant as necessary to keep the coolant reservoir (1) full.
  5. Do steps 3 and 4, with the coolant pump speed control dials (4) set to speed 3.
  6. Do steps 3 and 4, with the coolant pump speed control dials (4) set to speed 4.

    Do not increase pump control dials (4) to speed 5. This will cause turbulence in coolant flow and will trap air bubbles in the coolant return lines.

  7. Let the two coolant pumps (3) run for 10 to 15 minutes. The air bubbles will disappear as the coolant circulates throughout the cooling circuit.
  8. Add coolant as necessary to keep the coolant reservoir (1) full.
  9. Install the filler plug (2) onto the coolant reservoir (1) and tighten with a large flathead screwdriver.
  10. Set the two coolant pump speed control dials (4) to speed 1. Pump control set to speed 1

    The default AON3D speed control dials (4) must be set to speed 1 before machine is entered into service.

Last modified: July 5, 2021