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Operation MAC2000
7. If more refrigerant needs to be added, press the Additional Charge
function key. Otherwise, press the Done function key to exit the
Snap-Shot mode.
8. Close the service-port valves; remove the service hoses from the
vehicle; then press the Start key to recover the hoses.
Important!
If the hoses are not removed from the vehicle before the
Start key is pressed, the refrigerant in the vehicle will be recovered!
9. If any oil was removed during the recovery or evacuation process,
make sure that the proper amount of oil is added back into the
vehicle’s A/C high side port in accordance with the vehicle
manufacturer’s recommendations. Add an amount of new oil equal
to the amount collected in the oil drain bottle (see MAC2000 Left-
Side View, Page 5).
3.6 System Flush Mode (Oil Flush)
The System Flush mode is designed to be used on General Motors
vehicles using their Oil Flush Adapter and Filter accessory. This
accessory is attached inline with the vehicle’s compressor and is used
to flush the A/C system with refrigerant. In this mode, refrigerant is
circulated through both the A/C system and the MAC2000 where an
oil separator removes the oil and returns oil-free refrigerant back into
the A/C system for further flushing. At the end of the cycle, the
refrigerant is completely removed from the A/C system and stored in
the unit’s internal storage tank. The flushing process can take up to
30–45 minutes to complete. Because of the variety of A/C system
configurations currently in service, the flush may bypass certain
sections of the A/C system. To ensure the complete system is flushed,
the technician may need to pinch off certain hoses to force the
refrigerant flush throughout the system.
1. Before beginning the flushing process, recover all refrigerant from
the vehicle’s A/C system per Section 3.3 Recovery Mode.
2. From the Main menu, press the Next menu function key to display
Menu 2, and then press the System flush function key to select the
System Flush mode. The unit reminds the technician to “Please
empty the purge oil bottle prior to flushing.”
3. Press Start to continue. The unit now reminds the technician to
install the inline flushing adapter and remove the orifice tube or
TXV valve before continuing.
4. If not already done, connect the high- and low-side service hoses to
their respective service ports, and ensure that the service-port
valves are open.
22 Instruction 2072-0400