• Refill new coolant by creating a vacuum in the cooling system
• No need to undergo time-consuming air bleeding after refilling new coolant
• Sealing collar with three rubber bushings offers a wide variety of applications for radiator filler necks
• Minimizes the risk of engine overheating

Mastercool 43012 Kit Includes:

• Vacuum Gauge (43013-001-G): 0 – 30 inHg
• Sealing Collar: Turn clockwise to expand rubber
• Valve: To control air and coolant flow
• Quick Coupling: For connecting vacuum pump and coolant hose
• Venturi Style Vacuum: To connect with an air compressor to create vacuum
• Rubber Gasket – small (43012-35): OD 35 mm x ID 30 mm
• Rubber Gasket – medium (43012-39): OD 39 mm x ID 30 mm
• Rubber Gasket – large (43012-44): OD 44 mm x ID 30 mm
• Coolant Hose: 0.5” x 47” long
• Drain Hose: For draining residual fluid in the radiator and the tool

Create a Vacuum:

1. Drain the coolant from the radiator.
2. Select a suitable sized rubber bushing and fit it to the lower part of the tool. Insert the tool into the radiator filler neck. Turn the sealing collar to make a seal between the tool and the radiator filler neck.
3. Connect the vacuum pump to the quick coupling.
4. Connect the drain hose to the vacuum pump in case there is residual fluid inside the system.
5. Connect shop air to the vacuum pump.
6. Turn the valve on to create a vacuum in the radiator (Fig. 1).
7. Turn the valve off when the gauge reading falls is between 20 - 24 inHg.
8. Disconnect the shop air from the vacuum pump.

Refill Coolant:

1. Disconnect the vacuum pump from the quick coupling.
2. Connect the coolant hose to the quick coupling.
3. Put the other end of the coolant hose in a pre-mixed coolant container.
• NOTE: Make sure there is enough coolant to fill the cooling system.
• NOTE: Make sure the hose end is always submerged by the coolant.
4. Turn the valve on to transfer the coolant into the cooling system.
5. Turn the valve off when the gauge reading is 0 inHg.
6. Remove the tool from the cooling system.
7. Clean the tool prior to storage.