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Ford Motor Co.

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CAUTION: An A/C refrigerant analyzer must be used before recovery of any vehicles A/C refrigerant. Failure to do so puts the shops bulk refrigerant at risk of contamination. All contaminated A/C refrigerant must be disposed of as hazardous waste. For all equipment, follow equipment manufacturers procedures and instructions.
CAUTION: Suction accumulator, muffler, hoses and fixed orifice tube should be removed when flushing A/C system. Internal plumbing of these devices makes it impossible to correctly remove any residual-flushing agent. Except for hoses, these components are typically discarded after A/C system contamination. Hoses without mufflers can normally be reused unless they are clogged with foreign material. The one gallon of A/C Systems Flushing Solvent (F4AZ-19579-A) and filter (FL1-A) used in A/C Flush/Purge Machine (219-00022) are intended for use on one vehicle only. They may be used to flush both A/C condenser core and A/C evaporator core on an individual vehicle, but under no circumstances should they be used on more than one vehicle.
NOTE: Prior to using A/C Flush/Purge Machine (219-00022) for the first time, review operating instructions.
NOTE: Only A/C Flush/Purge Machine Kit (219-00023), which includes A/C Flush/Purge Machine (219-00022), A/C Flush/Purge Fitting Kit (219-00024) and A/C Systems Flushing Solvent Part No. F4AZ-19579-A, is approved for use on Ford vehicles. No other flushing device or solvent is approved for flushing heat exchangers. Use of any other flusher or solvent may cause damage to A/C system and flushing unit. Ford Motor Company has approved a procedure to provide technicians with a non-CFC method of flushing contaminated A/C system heat exchangers, A/C evaporator core and A/C condenser core. The procedure allows specific components to be cleaned and flushed while installed in their normal in-vehicle location. The types of contamination flushed include particle matter that results from A/C compressor or desiccant failure within suction accumulator and gummy residue that can form when refrigerant oil is overheated during A/C compressor seizure. The flushing process is a 2-step procedure that involves the use of an A/C flush/purge machine to:
  • Circulate flushing solvent through heat exchanger in reverse direction of normal refrigerant flow (back-flushing). Particulate matter picked up during flushing is filtered from returning solvent before solvent is returned to reservoir for continued circulation.
  • Remove flushing solvent from heat exchanger. In this step of procedure, pressurized air 90-125 psi is used to push and evaporate any remaining flush solvent from heat exchanger.
  1. Recover refrigerant. See FORD MOTOR CO.  under RECOVERY/EVACUATION & RECHARGING.
  2. Disconnect refrigerant lines from heat exchanger(s) to be flushed.
  3. Connect A/C flush/purge machine fitting kit and A/C flush/purge machine to heat exchanger to be flushed. DO NOT flush through evaporator core, orifice, mufflers or hoses. Internal plumbing and material make-up of these components make it impossible to correctly remove foreign material or residual flushing solvent.
    4. NOTE: Use one gallon of A/C systems flushing solvent to flush heat exchanger for a minimum of 15 minutes. The flushing solvent may be used for one or both heat exchangers in A/C system. However, flush solvent is intended for one vehicle only. The filter used on flushing unit is also intended for use on one vehicle only.
  4. Flush heat exchanger for a minimum of 15 minutes.
  5. Apply 90-125 psi pressurized air to component for a minimum of 30 minutes. The 30-minute purge time is required to force and evaporate all residual solvent from A/C system component. Failure to successfully remove all residual solvent within component can result in system damage when reconnected and operated. Dispose of used flush solvent and filter in accordance with local, state and federal regulations.
    6. NOTE: A/C system filtering is optional if system flushing is carried out. However, filter kit use is recommended after flushing if A/C system contamination is extensive. See FILTERING PROCEDURES (FORD) .
  6. Install a NEW A/C evaporator core orifice in any vehicle being serviced for an internal A/C compressor or desiccant failure.
  7. Install NEW refrigerant hoses if clogged with foreign material.
  8. Install a NEW suction accumulator in any vehicle being serviced for an internal A/C compressor or desiccant failure.
  9. Reconnect heat exchanger being serviced.
  10. If a NEW A/C compressor is not to be installed, lubricate refrigerant system with correct amount of clean PAG oil. See SPECIFICATIONS in appropriate MANUAL A/C HEATER SYSTEMS or AUTOMATIC A/C HEATER SYSTEMS article.
  11. If a NEW A/C compressor is not to be installed, evacuate, leak test and charge A/C system. See FORD MOTOR CO.  under RECOVERY/EVACUATION & RECHARGING.
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