Refrigerant Recovery & Recharging; System Flushing - Chevrolet Trailblazer Service Manual

Refrigerant Recovery & Recharging
NOTE: It is not possible to determine the amount of refrigerant in an A/C system without
completely evacuating the system and recharging it. Always refer to the underhood
heating and air conditioning specification tag for the proper amount of refrigerant.
CAUTION
Do not add more refrigerant to the system than specified by the manufacturer. Excessive
system pressure may cause compressor failure.
CAUTION
A small amount of refrigerant oil is removed from the system each time the refrigerant is
recovered into a refrigerant recovery/recycling station. This amount of oil must be returned
to the system when the system is recharged. Follow the manufacturer's instructions that
came with the equipment being used.
A refrigerant recovery/recycling station is needed to recover refrigerant from an A/C
system. Connect the equipment to the vehicle's A/C system according to the
manufacturer's instructions.

System Flushing

After a catastrophic compressor failure, it is extremely important to eliminate and/or
contain the debris from the compressor that may have circulated through the A/C system.
The debris generated from a catastrophic compressor failure will be discharged into the
compressor suction line, discharge line, condenser and liquid line and may cause the new
compressor to fail prematurely. In addition to flushing, a liquid line filter should be installed
in the system to stop any remaining debris from circulating through the system.
Most refrigerant recovery/recycling stations have the ability to flush the system with
cleaned and dry refrigerant. Keep in mind that the refrigerant oil in the system will also be
removed and must be replaced when refrigerant is added to the system. Follow the
instructions that came with the equipment to properly flush the A/C system.