Viper AF3400, 7500, AF3200, AF3250 User Manual

VIPER FLUSHING SERVICE INSTRUCTIONS

(For Models AF3200, AF3250, AF3400, 7500 and most shop

air powered Cooling System Service Units from VIPER and SOLAR)

GENERAL OPERATING INFORMATION

POWER: The following instructions are designed for units powered by shop air pumps. Units

utilizing 12V pumps do not have enough power to perform flushing or back-flushing services.
VIPER and SOLAR Cooling system Service Centers require incoming air pressure be regulated
to a minimum of 45 psi and a maximum of 125 psi. Pressures outside of this range will cause
operating problems and void the warranty.

CAPACITY: VIPER AF3250, AF3400, and SOLAR 7500 models have side mounted tanks, each
providing a working capacity of 7 gallons and total capacity of 8 gallons. The tanks come with easy
to read capacity markings and can be quickly removed for storage and cleaning. Replacement tank
kits (Part No. 5030) are available, offering easy conversion between different types of coolants.
Each tank has 2 flow tubes placed into it. The pickup tube is the longer tube and pulls fluid from the
bottom of the tank. The intake tube is the shorter tube and drops all incoming fluid into the top of the
tank. This arrangement allows good mixing of fluid and avoids any tube-to-tube streaming.

Other VIPER and SOLAR models use internal tanks with differing capacities. Refer to the User’s
Guide that accompanies each unit for more detailed information.

OPERATION: The VIPER AF3250, AF3400 and SOLAR 7500 models all utilize an easy-to-use
control panel, which includes Service Valves, a System Pressure Gauge and a Rotary Control Knob.

NOTE: Models with recycling capability will also have a Filter Control Knob and a Filter Pressure Gauge.
Neither of these will be used during the vehicle service and are only used during the recycling process.

Service Valves are labeled as follows: “Pump From” and “Pump To”. Operation of the machine
requires only that the user select where the fluid comes from (Used Tank, New Tank or Vehicle) and
where the fluid is to be directed to (Used Tank, New Tank or Vehicle).

With the wide selection of fluid direction options, a technician can perform a vehicle service, mix fluid
inside one tank, transfer fluid between the 2 tanks, pull fluid from the vehicle or empty the tanks into
outside containers.

NOTE: Other VIPER and SOLAR cooling system service models utilize unique valve control options – refer to the
User’s Guide that accompanies each unit for specific control function. All steps of service will remain the same.

SERVICE HOSES: Nearly all VIPER and SOLAR Cooling System Service models utilize 2 Service
Hoses, one red and one black. The black service hose is the working hose while the red hose functions
as a return hose during vehicle service. The red hose includes a clear segment, allowing the technician
to view the fluid exiting the vehicle. Each model comes supplied with quick connect couplers, to be
installed on the vehicle end of each service hose. Each hose contains a removable screen (placed in
the end of hose closest to the machine) to keep contaminants from flowing into and damaging the
machine’s pump. To ensure maximum pump life, never run a machine with the screens removed.

ACCESSORIES: Each model includes a variety of cooling system service accessories, including
differing sizes of Heater Hose Tees, Radiator Hose Adapters and Radiator Cap Adapters. Also
available is an Overflow Evacuation Hose that enables evacuation of fluid from the overflow container.

Heater Hose Tees are designed for permanent installation in a vehicle, such as fleet applications where
technicians regularly service the same vehicles. Care must be taken when installing Tees to position
them in an easily reached location, providing hassle-free access for future services.

Radiator Hose Adapters come in pairs and include one matching hose for installing an Adapter to
either the radiator or to the thermostat housing. Always install the adapter with the open side towards
the cooling system component and use hose clamps to secure both the hose to the adapters and to the
vehicle.

The Radiator Cap Adapters come in two styles and allow easy connection to the vehicle’s radiator.
Part No. 5016 is a threaded style Radiator Cap Adapter that fits late model Ford and GM vehicles
where the radiator cap is mounted on the coolant overflow container. Part No. 5042 is a universal
cone style Radiator Cap Adapter that fits nearly all passenger vehicles. Part No. 5042 allows quick
attachment for lowering the fluid level in the radiator or the overflow tank, which allows a spill-free
upper radiator hose connection. Use a Male Quick Connect insert, when possible, with a Radiator
Cap Adapter to allow quick and easy interface between the Radiator Cap Adapter and Service Hoses.

VEHICLE SERVICE – COLD CAR / REVERSE FLOW SERVICE METHOD

Note; This service procedure requires a cooling system configuration where the thermostat is mounted in the

traditional location on the top of the engine. Vehicles using certain engine configurations (such as the older GM
Quad 4, late model GM 5.3L V8 and the Jeep / Dodge 4.7L) that utilize a low mounted thermostat need to
be serviced using a hot car method as described in the User’s Guide found with your coolant machine.

The Cold Car / Reverse Flow Service Method is the recommended way to service most vehicles.
In this case, “Cold Car” is a reference to the fact that the vehicle is not running during the service.
The key benefits of this style of service are improved cleansing effectiveness and reduced difficulty
over other service options.

This service technique results in a quicker, easier service routine, utilizes a back-flush reverse fluid flow
for better cleaning action and avoids the complications and technician concerns related to servicing a
running vehicle. For even greater cleansing effectiveness, this style of service can be combined with a
solvent-based cooling system cleaner (like VIPER Part No. 5090) to create the most effective cleaning
action and remove more build-up of contaminants from the inside of the cooling system.

Prior to starting any cooling system service, perform a visual inspection of the cooling system, looking
for obvious signs of system failures, such as missing components or leaking fluids. Always inquire from
the customer as to the recent operation of system and the service history of the vehicle. Activated
service lights, abnormal gauge readings and lack of heat, are all symptoms of greater service needs.
Inquiring before beginning the service will save time and result in greater customer satisfaction.