Vac-N-Fill Procedure
To prevent boiling of the coolant/water mixture in the vehicles cooling system, do not apply vacuum to a cooling system above 49°C (120°F). The tool will not operate properly when the coolant is boiling.
- Attach the Vac-N-Fill cap to the vehicles coolant fill port.
- Install the extension hose.
- Attach the vacuum gauge assembly to the Vac-N-Fill cap.
- Attach the fill hose to the barb fitting on the vacuum gauge assembly.
Ensure that the valve is closed.
- Pour the coolant mixture into the graduated reservoir.
- Place the fill hose in the graduated reservoir.
- Install the vacuum tank on the graduated reservoir with the fill hose routed through the cut-out area in the vacuum tank.
- Attach the venturi assembly to the vacuum tank.
- Attach a shop air hose to the venturi assembly.
Ensure the valve on the venturi assembly is closed.
- Attach the vacuum hose to the vacuum gauge assembly and the vacuum tank.
- Clamp off the overflow hose.
- Open the valve on the venturi assembly. The vacuum gauge will begin to rise and a hissing noise will be present.
- Continue to draw vacuum until the needle stops rising. This should be 610-660 mm Hg (24-26 in HG).
Cooling hoses may start to collapse. This is normal due to vacuum draw.
- To aid in the fill process, position the graduated reservoir above the coolant fill port.
- Slowly open the valve on the vacuum gauge assembly. When the coolant reaches the top of the fill hose, close the valve. This will eliminate air from the fill hose.
- Close the valve on the venturi assembly.
- If there is a suspected leak in the cooling system, allow the system to stabilize under vacuum and monitor for vacuum loss.
If vacuum loss is observed, refer to Loss of Coolant .
- Open the valve on the vacuum gauge assembly. The vacuum gauge will drop as coolant is drawn into the system.
- Once the vacuum gauge reaches zero, close the valve on the vacuum gauge assembly and repeat steps 11-17.
Remove the extension hose.
- Remove the J 42401 radiator cap and surge tank test adapter.
- Detach the Vac-N-Fill cap from the vehicles coolant fill port.
- Add coolant to the system as necessary.
- Inspect the concentration of the coolant mixture using J 26568 coolant and battery tester.
- Detach the vacuum hose form the vacuum gauge assembly.
- Attach the extraction hose to the vacuum hose.
- Open the valve on the venturi assembly to start a vacuum draw.
- Use the extraction hose to draw out coolant to the proper level.
- The vacuum tank has a drain valve on the bottom of the tank. Open the valve to drain coolant from the vacuum tank into a suitable container for disposal.
Use a 50/50 mixture of DEX-COOL antifreeze and clean, drinkable water. Always use more coolant than necessary. This will eliminate air from being drawn into the cooling system.
Prior to installing the vacuum tank onto the graduated reservoir, ensure that the drain valve located on the bottom of the tank is closed.
After filling the cooling system, the extraction hose can be used to remove excess coolant to achieve the proper coolant level.