Air Conditioning System Flushing Procedure

Safety First

Always Use Eye Protection! 

  1. A/C system refrigerant must be completely recovered using approved equipment in accordance with local, state, and federal laws.
  2. Disconnect all hoses from components to be flushed. Remove the orifice tube which is located in the liquid line or at the condenser or evaporator, or the expansion valve.
  3. Remove the cap. Add gpd flush 8011256 (or equivalent) to cylinder. Replace the cap. All flush cylinder connections must be tight.
    • Never Flush the A/C compressor, the orifice tube, the expansion valve, the accumulator, or the receiver drier
  4. It is generally advisable to first “back-flush”, flushing from outlet to inlet on condensers and evaporators, to dislodge debris. Then flush the component from inlet to outlet.
  5. To prevent spraying of flush, oil, and other debris, attach a hose or optional flush capture hose to the exit end of the component to be flushed. Place the [...]
Car Care Tip Condenser flushing diagram

The parallel flow condenser is by far the most efficient condenser to use with R134a refrigerant. The multi-channel construction and multiple passes the refrigerant makes through the condenser allows maximum heat transfer. The smaller tubes and wide surface area allows the most refrigerant to come in contact with air flowing through the condenser fins.

The reasons for this efficiency is also one of its major drawbacks. These small tubes that efficiently transfer heat are so small that they trap any contamination in the system that tries to pass through them. Flushing will not remove the contamination from the condenser. This contamination will create a restriction in the condenser and make the high side pressures go up. This forces the compressor to work harder and possibly fail. Contamination in the condenser can also work itself free and end up at the compressor where it will also cause a failure.

If there is a situation where the [...]

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