2003 FORD MUSTANG heater

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Page 3052 of 4378

FORD MUSTANG 2003  Workshop Manual Item  Part Number  Description 
1  18A318  Vacuum control motor, panel/defrost door 
2  18A478  Panel/defrost door (full vacuum position) 
3  — Defrost airflow 
4  — Side window demister airflow

Page 3053 of 4378

FORD MUSTANG 2003  Workshop Manual Function Selector Switch Vacuum Connector 
V=Vacuum 
NV=No Vacuum 
Inspection and Verification 
1. Verify the customers concern by operating the climate control system to duplicate the condition.  16

Page 3055 of 4378

FORD MUSTANG 2003  Workshop Manual Symptom Chart 
Condition 
Possible Sources  Action 
�z Incorrect/erratic direction 
of airflow from outlet(s)  �z
No vacuum to A/C heater 
function switch selector. 
�z A/C heater function selector 
s

Page 3056 of 4378

FORD MUSTANG 2003  Workshop Manual Pinpoint Tests 
PINPOINT TEST P1464: DTC P1464: A/C DEMAND OUT OF SELF-
TEST RANGE  high speed 
motor switch resistor. 
�z Damaged heater blower 
motor switch.  Test H  . 
�z No operation in high 
blo

Page 3057 of 4378

FORD MUSTANG 2003  Workshop Manual PINPOINT TEST A: INCORRECT/ERRATIC DIRECTION OF AIRFLOW 
FROM OUTLET  �z
Is there voltage present?  Test Step  Result / Action to 
Take  A1 CHECK AIRFLOW FROM DEFROSTER OUTLETS 
�z
Key in START positi

Page 3063 of 4378

FORD MUSTANG 2003  Workshop Manual PINPOINT TEST B: INSUFFICIENT, ERRATIC, OR NO HEAT  �z
Does the vacuum control motor hold a vacuum?  A20 CHECK THE VACUUM CONTROL MOTOR INSTALLATION 
�z
Key in OFF position. 
�z Check the attachment o

Page 3064 of 4378

FORD MUSTANG 2003  Workshop Manual PINPOINT TEST C: THE A/C DOES NOT OPERATE/DOES NOT 
OPERATE CORRECTLY  �z
Is the heater core inlet hose too hot to handle?  B3 CHECK THE ENGINE COOLING SYSTEM INCLUDING 
RADIATOR CAP FOR LEAKS  �z
Fil

Page 3083 of 4378

FORD MUSTANG 2003  Workshop Manual PINPOINT TEST H: THE BLOWER MOTOR OPERATES 
CONTINUOUSLY IN HIGH SPEED  �z
Check the resistance between C294a- 3, circuit 1205 (B/K) 
harness side and ground. 
�z Is the resistance less than 5 ohms?