Bosch ACS 653 Repair Instruction page 114

Plumbing and Mechanical
ACS 653, ACS 663 Service Manual
HOSE FLUSH PROCESS
Flushing of the hoses is required if the next vehicle to be serviced contains a different type of A/C system oil than the
previous vehicle serviced. During the Hose Flush Process, the compressor and tank liquid solenoid are activated.
The high side and low side charge, high side and low side inlet and recover solenoids are intermittently activated in
a charge/recover process to flush hoses or residual oils.
Figure 4-22. Hose Flush
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SP00D00624 2021-04-08 Robert Bosch GmbH