LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2013 >> Mustang GT, 2D Convertible, Automatic Trans >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control System - General Information And Diagnostics >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test O: The Air Conditioning (A/C) is Always On - A/C Mode Always Commanded ON >> Pinpoint Test O: The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded On
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Pinpoint Test O: The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded On

NOTE: Before carrying out the following test, diagnose any HVAC, PCM or IC DTCs.
  1. O1 CHECK THE AIR CONDITIONING SWITCH STATUS (CC_SW_AC) HVAC PID WITH THE A/C OFF 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: CC_SW_AC HVAC PID.
    • Select PANEL press the A/C button (indicator off) on the HVAC controls.
    • Does the CC_SW_AC HVAC PID read Inactive? 
    • Yes  : GO to O2.
    • No  : INSTALL a new Front Controls Interface Module (FCIM). TEST the system for normal operation.
  2. O2 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: AC_REQ PCM PID.
    • Select PANEL press the A/C button (indicator off) on the HVAC controls.
    • Does the AC_REQ PCM PID read OFF? 
    • Yes  : GO to  O5.
    • No  : GO to O3.
  3. O3 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH HVAC MODULE DISCONNECTED 
    • Disconnect: HVAC Module C294A.
    • Disconnect: HVAC Module C294B.
    • Enter the following diagnostic mode on the scan tool: ACCS PCM PID.
    • Observe the AC_REQ PCM PID.
    • Does the AC_REQ PCM PID read OFF? 
    • Yes  : GO to O4.
    • No  : GO to  O5.
  4. O4 CHECK THE HVAC MODULE CONNECTION 
    • Inspect the HVAC module connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the HVAC module connectors.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. O5 CHECK THE PCM CONNECTION 
    • Disconnect all the PCM connectors.
    • Inspect the HVAC module connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the PCM connectors.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new PCM. TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
scientia non olet · About LEMON Manuals