Ford 2003 Mustang Workshop Manual page 3079

PINPOINT TEST F: NO OPERATION IN ALL TEMPERATURE
SETTINGS
F1 CHECK THE TEMPERATURE CONTROL
Start the engine and run at idle. Allow the engine to reach
normal operating temperature.
Place the function selector switch in the NORMAL A/C
position.
Adjust the temperature control to full warm position, and
physically feel the discharge air temperature at the at the
center panel vents.
Rotate the temperature control to full cold position, and
physically feel the discharge air temperature at the center
panel vents.
Does the discharge air temperature vary?
F2 CHECK FOR A BROKEN A/C TEMPERATURE CONTROL
CABLE
Remove the climate control assembly to gain access to the
control cable head.
Move the temperature control from full warm to full cold.
Inspect the cable control head as you move the temperature
control.
Does the alignment mark on the control head move?
PINPOINT TEST G: THE BLOWER MOTOR DOES NOT
OPERATE/DOES NOT OPERATE CORRECTLY
G1 CHECK FOR VOLTAGE AT C238
Disconnect: Blower Motor Jumper C238.
Key in ON position.
Turn the blower motor selector to LOW.
Turn the function selector to FLOOR.
Check for voltage between C238-6, circuit 249 (DB/LG) and
C238-3, circuit 261 (OG/BK).
Test Step
Test Step
INSTALL a new A/C
compressor due to low
performance. REFER to
Section 412-03 . TEST the
system for normal operation.
Result / Action to Take
Yes
The temperature blend
door is functioning
correctly. RETURN to the
symptom chart.
No
GO to F2 .
Yes
INSTALL a new
evaporator housing.
REFER to Section 412-
02 .
No
INSTALL a new
temperature control cable
assembly. REFER to
Section 412-04 .
Result / Action to Take
Yes
GO to G2 .
No
GO to G4 .