Ford 2003 Mustang Workshop Manual page 3091

SECTION 412-00: Climate Control System - General Information
GENERAL PROCEDURES
Air Conditioning (A/C) System Check — Retail Procedure
NOTE: This Retail Procedure is not eligible for claiming on Ford paid repairs (warranty and ESP).
NOTE: The engine should be run at idle for 10 minutes with the air conditioning on and set to MAX A/C
before carrying out this retail procedure.
NOTE: Read and follow all of the Warnings, Cautions and Notes at the beginning of this section before
continuing.
1. Visual inspection
Open the hood and visually inspect the heating and air conditioning systems for the following:
Coolant reservoir for correct coolant level
Heater hoses for deterioration or loose connections
Radiator and condenser for debris or damaged fins restricting airflow, loose mounting or
connections
Accessory drive belt(s) and cooling fan(s) for wear or physical damage
Refrigerant lines and connections for physical damage or loose connections
Compressor for physical damage or loose connections
Suction accumulator/drier for physical damage or loose connections
Wiring and connectors for excessive wear, loose or damaged connections, or incorrect
routing
2. A/C refrigerant analysis
Carry out air conditioning refrigerant analysis. For additional information, refer to
Refrigerant Identification Testing
If the refrigerant fails the analysis, discontinue diagnosis and make recommendations for
repairs.
If the refrigerant passes the analysis, carry out the air conditioning system check.
3. Air conditioning system check
Connect manifold gauge set or charging station with gauges to refrigerant system.
With the vehicle in park, parking brake set, thermometer installed in center panel vent,
and air conditioning system on and set to MAX A/C, start the engine.
Record air refrigerant system pressures while running the engine at 1,500 rpm and allow
engine to return to idle.
Operate the blower motor in all control positions and check for correct blower speed
changes.
With the blower motor on HI, operate air discharge mode selector in all positions and
check for correct airflow in each position.
Operate the temperature blend selector in all positions and check for correct change in
discharge temperature. Check the air discharge temperature with the selector in the
coolest position and the air conditioning on and set to MAX A/C to determine if the air
discharge temperature is acceptable for the current ambient air temperature.
Carry out the EATC self-test (if applicable).
If the refrigerant system pressures were low, carry out the refrigerant system leak test.
2003 Mustang Workshop Manual
in this section.