Viper 7500, AF3400, AF3200, AF3250 Cold Car / Reverse Flow Service Method - Vehicle Connection

Cold Car / Reverse Flow Service Method: Step 1 – Vehicle Connection

1.Remove radiator cap from vehicle and attach the proper Radiator Cap Adapter with male Quick Connect Insert installed.

2.Connect the Black Service Hose to the Radiator Cap Adapter, and position the Control Valves as follows: “Pump To” Processing Tank; “Pump From” Vehicle. (Some models may have different valve configurations – refer to the User’s Guide for matching valve positioning.)

3.Start the pump, remove fluid from vehicle until the upper radiator hose is completely collapsed and stop the pump. (Note: Do not exceed 20 inches of vacuum –the pump is powerful enough to collapse radiator and heater cores.)

4.Remove the Black Service Hose from the Radiator Cap Adapter and replace the Radiator Cap Adapter with the vehicle’s radiator cap. (Highly recommended practice, as this will allow testing of the cap for proper operation and will act as a safety valve during coolant service).

5.Remove the upper radiator hose from either the radiator or the thermostat housing (thermostat housing is preferred connection point).

6.Install the correct Cross Flow Adapters into the upper radiator hose and the radiator / thermostat housing. Ensure the closed ends are on the outside connection point. Check that all connections are properly secured with hose clamps.

7.Install a Female Quick Disconnect onto each Cross Flow Adapter.

8.The vehicle is now ready to be tested and serviced.

Cold Car / Reverse Flow Service Method: Step 2 – System Testing

Note: It is recommended that the system test be performed prior to service to ensure the integrity of the cooling system. The detailed vehicle connection steps listed below will help provide a clean vehicle connection minimizing any coolant spillage.

1.Connect the Black Service Hose to the Cross Flow Adapter closest to the radiator. Leave the Red Service Hose disconnected from the vehicle.

2.Turn the pump ON, using care to avoid over-pressuring the vehicle system. Monitor the pressure gauge and listen/watch for signs when the radiator cap is releasing. Ideally, the cap should release within +/- 3 psi of the rated pressure (rating is printed on cap). To determine current pressure relief of cap, listen for air escaping around cap seals or watch for bubbling in overflow tank. It is important, for proper vehicle function, that the radiator cap operate as rated. Caps that are opening at the incorrect pressure ratings can cause overheating and other coolant system circulation problems.

3.As soon as pressure release value is determined, stop the pump and monitor the pressure gauge, watching for leaks. Always replace defective radiator caps and perform any necessary system repairs before proceeding with coolant service. Avoid putting more pressure into the system than the cap is rated for. Excessive pressures may damage the radiator.

4.After finishing the cap test, remove the Black Service Hose from Cross Flow Adapter closest to radiator and connect to the Cross Flow Adapter closest to the thermostat housing. Vehicle is now ready for coolant service.