Symptom Chart - Climate Control Systems
NOTE:
Some PCM Diagnostic Trouble Codes (DTCs) may inhibit A/C operation. If any PCM Diagnostic Trouble Codes (DTCs) are retrieved, diagnose those first. Refer to the PCM DTC Chart.
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
| Condition | Possible Sources | Actions |
|---|---|---|
| Unable to duplicate the customer concern and no Diagnostic Trouble Codes (DTCs) present | Refer to the Pinpoint Test | GO to Pinpoint Test E |
| A module does not respond to the diagnostic scan tool | Fuse Wiring, terminals or connectors HVAC control module |
REFER to: Communications Network . |
| Externally Controlled Variable Displacement Compressor (EVDC) poor performance/does not operate correctly | Refer to the Pinpoint Test | GO to Pinpoint Test S |
| Insufficient Air Conditioning (A/C) cooling | Improper refrigerant level | PERFORM the refrigerant system tests. REFER to the appropriate GENERAL PROCEDURES . If OK, DIAGNOSE for a temperature door actuator not operating correctly. |
| Temperature door actuator | GO to Pinpoint Test K | |
| The A/C is always on -- A/C mode always commanded on | Refer to the Pinpoint Test | GO to Pinpoint Test J |
| The A/C is inoperative | Refer to the Pinpoint Test | GO to Pinpoint Test I |
| The A/C pressure relief valve is discharging | High system pressure A/C pressure relief valve |
Using the appropriate manifold gauge set, CHECK the A/C system pressure. If the system pressure is above the A/C pressure relief valve open pressure, 3, 447-4, 137 kPa (500-600 psi), REPAIR the system for a restriction. CHECK the high side system pressure. If the pressure is below the A/C pressure relief valve open pressure, 3, 447-4, 137 kPa (500-600 psi), INSTALL a new A/C compressor. REFER to the appropriate REMOVAL AND INSTALLATION . |
| The air inlet door is inoperative | Refer to the Pinpoint Test | GO to Pinpoint Test F |
| The front blower motor is inoperative | Refer to the Pinpoint Test | GO to Pinpoint Test L |
| The front blower motor does not operate correctly | Refer to the Pinpoint Test | GO to Pinpoint Test M |
| The front electric booster heater is inoperative or does not operate correctly | Refer to the Pinpoint Test | GO to Pinpoint Test A |
| Incorrect or erratic direction of airflow from outlets | Refer to the Pinpoint Test | GO to Pinpoint Test G |
| Insufficient, erratic or no heat | Refer to the Pinpoint Test | For engine coolant/heater core related concerns, GO to Pinpoint Test H For front electric booster heater related concerns, GO to Pinpoint Test A |
| Reduced outlet airflow | Plugged pollen filter | INSPECT the pollen filter. REFER to the appropriate REMOVAL AND INSTALLATION . If OK, DIAGNOSE for low refrigerant charge, A/C always commanded on or blower motor not operating correctly. |
| Improper refrigerant level | PERFORM the refrigerant system tests. REFER to the appropriate GENERAL PROCEDURES . If refrigerant charge is OK, GO to Pinpoint Test J | |
| Blower motor | GO to Pinpoint Test M | |
| The temperature control is inoperative or does not operate correctly | Refer to the Pinpoint Test | GO to Pinpoint Test K |
| The temperature setpoint does not repeat after setting the ignition to OFF | HVAC control module | INSTALL a new HVAC control module. REFER to the appropriate REMOVAL AND INSTALLATION . |