Ford 2003 Mustang Workshop Manual page 3118

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 the 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 the suction accumulator/drier
and gummy residue that can form when refrigerant oil is overheated during A/C compressor
seizure. The flushing process is a two-step procedure that involves the use of an A/C Flush and
Purge Machine 219-00022 to:
Circulate the flushing solvent through the heat exchanger in the reverse direction of
normal refrigerant flow (back-flushing). Particulate matter picked up during flushing is
filtered from the returning solvent before the solvent is returned to the reservoir for
continued circulation.
Remove the flushing solvent from the heat exchanger. In this step of the procedure,
pressurized air 621-862 kPa (90-125 psi) is used to push and evaporate any remaining
flush solvent from the heat exchanger.
2. Discharge the A/C system. Observe all safety precautions. For additional information, refer to
the procedure in this section.
3. Disconnect the refrigerant lines from the heat exchanger(s) to be flushed.
4. Connect the A/C Flush and Purge Machine 219-00022 and A/C Flush and Purge Fitting Kit 219-
00024 to the heat exchanger to be flushed. Do not flush through the A/C 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.
5. Use 3.785 liters (one gallon) of A/C Systems Flushing Solvent part number F4AZ-19579-A to
flush the heat exchanger for a minimum of 15 minutes. The flush solvent may be used for one
or both heat exchangers in the A/C system. However, the flush solvent is intended for one
vehicle only. The filter used on the flushing unit is also intended for use on one vehicle only.
6. Flush the component for a minimum of 15 minutes.
7. Apply 621-862 kPa (90-125 psi) pressurized air to the component for a minimum of 30 minutes.
The 30-minute purge time is required to force and evaporate all residual solvent from the A/C
system component. Failure to successfully remove all residual solvent within the component
can result in system damage when reconnected and operated. Dispose of the used flush
solvent and filter in accordance with local, state and federal emissions.
8. NOTE: A/C system filtering as described in this section is optional if system flushing is carried
out. However, the filter kit use is recommended after flushing if the A/C system contamination is
extensive.
Install a new A/C evaporator core orifice in any vehicle being serviced for A/C compressor or
desiccant failure.
9. Install new refrigerant hoses if clogged with foreign material.
10. Reconnect the heat exchanger being serviced.
11. Add additional refrigerant oil as required. For additional information, refer to the procedure in
this section.
12. Evacuate, leak test and charge the A/C system. For additional information, refer to the
procedure in this section.
13. Check the system for normal operation.