Harmful substances and solids can form in the refrigerant circuit and cause damage to components. Therefore, the flushing of air conditioning systems is one of the most important activities in the case of repairs and especially in the case of compressor damage.

WARNING: Replacing the compressor requires flushing the entire air conditioning system.

Compressors, expansion/throttle valves and filter dryers or accumulators, however, cannot be flushed. They must therefore be bridged with adapters during the rinsing process. After completion of the flushing process, the expansion/throttle valves and filter dryer or accumulator and consumables must be replaced.

Flushing is necessary to:

  • Removed impurities and harmful substances from the air conditioning circuit
  • carry out professional repairs
  • avoid expensive subsequent repairs
  • Warranty claims against suppliers to goods
  • Ensure customer satisfaction

2 different ways to rinse

With its integrated flushing function, the AC92EA air conditioning service unit enables the air conditioning systems to be flushed quickly and inexpensively with the liquid refrigerant R134a. An external flushing device and parts from a flushing adapter set must be used – both are sold separately. After starting the function on the device, the vehicle air conditioning system is filled with liquid refrigerant and then drained again. This cycle should be carried out three times in order to achieve the best possible cleaning effect.


  • No costs for the flushing medium
  • No disposal costs for the flushing medium
  • Removes loose dirt particles and oil
  • Method approved by various vehicle manufacturers
  • Cost efficient with R134a refrigerant


  • No optimal cleaning effect for stubborn dirt
  • The filter element of the dishwasher must be changed regularly
  • Air conditioning service unit is not otherwise available during use


Rinsing with a cleaning solution is also possible. The system components are flushed using a flushing device and a chemical solution. Residues of the flushing agent must be removed with nitrogen and the system must be dried with nitrogen.


  • Removes loose and stuck particles and oil
  • Very good cleaning result
  • Cheap on expensive R1234yf refrigerant


  • Cost for the flushing medium
  • Disposal costs for the flushing medium


What impurities can be removed by rinsing? What are the effects of these types of impurities?

    The material particles clog expansion valves, throttle valves (orifice tubes) or multi-flow components (condenser, evaporator).
    Expansion valves and orifice tubes can ice up. Acids can form due to chemical reactions of refrigerants and refrigerant oils with moisture, which causes hose assemblies and O-rings to become porous. The system components are then damaged by corrosion.
    The elastomer particles clog expansion valves, orifice tubes or multiflow components.
    Acids can form as a result of contaminated refrigerant or the mixing of different refrigerants. These can cause hose lines and O-rings to become porous. As a result, other system components can be damaged by corrosion.