Robinair 75700 Coolant Exchanger - Manual (Page 10)

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© 2003 SPX Corporation
Exchange Process
IMPORTANT: For correct operation of the
75700 unit, adjust Valve 1 and Valve 2 in the
sequence specified in these instructions.
1. Note the level of coolant in either the sight gauge
for the waste coolant tank or the new coolant
tank on the back of the unit.
2. Turn Valve 1 to EXCHANGE.
3. Turn Valve 2 to EXCHANGE.
4. Watch the fluid level indicator. After exchanging
the correct amount of coolant (based on the
vehicle’s cooling system capacity), turn Valve 1
OFF. Turn Valve 2 OFF.
Note: The coolant running through the waste
hose at this time should be clean. If not, continue
the exchange process until the coolant running
through the waste hose is clean.
Complete the Exchange Process
This procedure will top off the coolant in the
radiator and fill the coolant overflow reservoir.
1. Remove the step adapters and hoses. Reassemble
the upper radiator hose to the vehicle.
2. Release any pinched-off hoses.
3. Connect the siphon tube to the black hose (new
coolant).
4. Remove the radiator cap and/or coolant reservoir
cap.
5. Close the valve on the end of the black hose
(new coolant). See Figure 11.
6. Turn both valves on the 75700 to EXCHANGE.
7. Insert the siphon hose into the radiator and/or
coolant overflow reservoir, and open the valve on
the end of the black hose. Top off the coolant in
the radiator, and fill the coolant overflow
reservoir to the FULL indicator.
8. Replace the radiator cap and coolant reservoir
cap.
9. Start the engine to purge any air in the system.
Repeat the procedure to top off the coolant
system as needed.
Figure 11
l l l l l
l l l l l
Valve in
CLOSED
position.
Valve in
OPEN
position.
Black Hose
(new coolant)
Black Hose
(new coolant)
Tech Tip
Some vehicles require a different vehicle hookup
due to the way the coolant flows through the
system.
If, during the exchange process, you can’t hear
the pump running, and the flow rate is slower than
usual, it may be necessary to change the way the
hoses are connected to the vehicle.
1. Connect the clear hose (waste coolant) to the
step adapter leading into the engine.
2. Connect the black hose (new coolant) to the
step adapter leading into the radiator. The valve
on the black hose should be OPEN.
3. Leave the coolant overflow hose and any other
hoses connected to the coolant reservoir
pinched off.
4. Repeat the Exchange Process.