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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.