HVAC System - General Servicing Procedures: Maintenance Chevrolet Tracker II

FLUSHING A/C SYSTEM

There is considerable controversy over the question of whether or not to flush A/C systems or how to go about it. Before CFCs were classified as harmful to the environment, it was a common practice to open flush contaminants from a system. The waste fluid was vented to the atmosphere. This practice is now illegal and can no longer be used.

Most OEMs don't recommend A/C system flushing. They recommend replacing the defective component and installing a liquid line (in-line) filter ahead of the expansion valve or orifice tube. Ford Motor Company is one exception to this rule.

A/C System Flushing

1. Manufacturer recommends flushing contaminated system using one gallon of Ford A/C System Flushing Solvent (F4AZ-19579-A), Filter (FL-1A), A/C Flusher Fitting Kit (014-00992 or 219-00024) and A/C Flush/Purge Machine (014-00991 or 219-00022). DO NOT reuse flushing solvent and filter, they are intended to be used on one vehicle only.
2. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Disconnect refrigerant lines from heat exchanger (condenser or evaporator) to be flushed. Using flush and purge fitting kit, connect A/C flush and purge machine to heat exchanger according to manufacturer instructions.
3. Circulate flushing solvent through heat exchanger in reverse direction of normal refrigerant flow (back-flushing). Flush component for a least 15 minutes. Stop flow of solvent. To remove solvent from heat exchanger, apply 90-125 psi (6.3-8.8 kg/cm 2 ) of compressed air to component for at least 30 minutes.
4. Compressed air is used to purge and evaporate all residual solvent from component. A/C system can be damaged if any solvent remains in system. Dispose of used flush solvent and filter in accordance with local, state and federal emissions statutes.
5. Using an A/C system filter is optional after system flushing is completed. However, if A/C system contamination is extensive, a filter kit is recommended after flushing. See «A/C SYSTEM FILTERING»(ref-91424-S35783312342001041600000) .
6. After flushing is completed, install a NEW orifice tube if there has been a compressor failure or desiccant contamination. Install NEW refrigerant hoses if clogged with debris. Complete component installation, adding additional refrigerant oil as required. Evacuate, leak test and recharge A/C system and ensure proper operation.