2003 FORD MUSTANG Workshop Manual

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Page 3073 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST D: THE A/C IS ALWAYS ON �z
Is the resistance less than 5 ohms? No
REPAIR circuit 1205 (BK) for
an open. TEST the system for
normal operation.
Test Step Result / Action to Take
D1

Page 3074 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST E: INSUFFICIENT A/C COOLING C294c-
3, circuit 348 (PK), harness side and ground.
�z Is there voltage present? No
INSTALL a new function
selector switch. REFER to
Section 412
- 04

Page 3075 of 4378

FORD MUSTANG 2003 Workshop Manual E2 CHECK FOR NORMAL DISCHARGE PRESSURE
�z
Use the recorded data from the refrigerant system tests
to plot a vertical line for ambient temperature and a
horizontal line for compressor discharge (hig

Page 3076 of 4378

FORD MUSTANG 2003 Workshop Manual to plot a vertical line for ambient temperature and a
horizontal line for A/C clutch OFF time in seconds.
�z Is the intersection of the two lines above the upper
limit? DISCHARGE and RECOVER
the

to plot a vertical line for ambient temperature and a
horizontal line for A/C clutch OFF time in seconds.
z Is the intersection of the two lines above the upper
limit? DISCHARGE and RECOVER
the system to remove
excessive moisture or
refrigerant oil. REFER to
Air Conditioning (A/C) System
Recovery, Evacuation and
Charging . TEST the system
for normal operation.
No
GO to E7 .
E6 CHECK FOR A HIGH SUCTION PRESSURE
z
Refer to the data plot used to evaluate the system low
pressure performance in Step E3.
z Is the intersection of the two lines above the upper
limit? 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. E7 CHECK THE AMBIENT TEMPERATURE
z
Refer to the data plot used to evaluate the system A/C
clutch OFF time in Step E5.
z Is the ambient temperature above 26°C (80°F)? 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. E8 CHECK FOR A HIGH DISCHARGE PRESSURE
z
Refer to the data plot used to evaluate the system high
pressure performance in Step E2.
z Is the intersection of the two lines above the upper
limit? Yes
GO to
E9 .
No
GO to E11 .
E9 CHECK FOR A NORMAL LOW PRESSURE
z
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. Yes
REFER to
Section 303 - 03A or
Section 303 - 03B . to diagnose
the engine cooling system.
TEST the system for normal
operation. Klj . 27 ba
412003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

Page 3077 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is the intersection of the two lines within the upper
and lower limits? No
GO to
E10 .
E10 CHECK FOR A NORMAL TO LOW SUCTION
PRESSURE �z
Refer to the data plot used to evaluate the system l

Page 3078 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is the intersection of the two lines above the upper
limit? E13 CHECK FOR A NORMAL A/C CLUTCH OFF TIME
�z
Use the recorded data from the refrigerant system tests
to plot a vertical line for amb

Page 3079 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST F: NO OPERATION IN ALL TEMPERATURE
SETTINGS
PINPOINT TEST G: THE BLOWER MOTOR DOES NOT
OPERATE/DOES NOT OPERATE CORRECTLY INSTALL a new A/C
compressor due to low
performance. REFER

Page 3080 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is the voltage greater than 10 volts? G2 CHECK THE BLOWER MOTOR FOR VOLTAGE
�z
Key in OFF position.
�z Connect: Blower Motor Jumper C238.
�z Disconnect: Blower Motor C2066.
�z Key in ON positi

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