Ford 2003 Mustang Workshop Manual page 3076

to plot a vertical line for ambient temperature and a
horizontal line for A/C clutch OFF time in seconds.
Is the intersection of the two lines above the upper
limit?
E6 CHECK FOR A HIGH SUCTION PRESSURE
Refer to the data plot used to evaluate the system low
pressure performance in Step E3.
Is the intersection of the two lines above the upper
limit?
E7 CHECK THE AMBIENT TEMPERATURE
Refer to the data plot used to evaluate the system A/C
clutch OFF time in Step E5.
Is the ambient temperature above 26°C (80°F)?
E8 CHECK FOR A HIGH DISCHARGE PRESSURE
Refer to the data plot used to evaluate the system high
pressure performance in Step E2.
Is the intersection of the two lines above the upper
limit?
E9 CHECK FOR A NORMAL LOW PRESSURE
Use the recorded data from the refrigerant system tests
to plot a vertical line for ambient temperature and a
horizontal line for compressor suction (low) pressure.
DISCHARGE and RECOVER
the system to remove
excessive moisture or
refrigerant oil. REFER to
Conditioning (A/C) System
Recovery, Evacuation and
Charging . TEST the system
for normal operation.
No
GO to E7 .
Yes
REMOVE the A/C evaporator
core orifice to repair missing or
damaged (leaking) O-ring
seals. REFER to Section 412-
03 . TEST the system for
normal operation.
No
INSTALL a new A/C cycling
switch when the intersection of
the two lines is below the
lower limit. REFER to Section
412-03 . TEST the system for
normal operation.
Yes
This is normal operation for
the refrigerant system in high
humidity conditions.
No
DISCHARGE and RECOVER
the system to correct an
overcharge condition. REFER
to Air Conditioning (A/C)
System Recovery, Evacuation
and Charging . TEST the
system for normal operation.
Yes
GO to E9 .
No
GO to E11 .
Yes
REFER to Section 303-03A
Section 303-03B . to diagnose
the engine cooling system.
TEST the system for normal
operation.
Air
or