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 PCM DTC Chart .
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices, REFER to: Diagnostic Methods .
| Condition | Possible Sources | Actions |
|---|---|---|
| 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 Pinpoint Test | GO to Pinpoint Test C |
| Insufficient A/C cooling | Improper refrigerant level | PERFORM the refrigerant system tests. REFER to: Refrigerant System Tests . If OK, DIAGNOSE for a temperature door actuator not operating correctly. |
| Temperature door actuator | GO to Pinpoint Test I | |
| The A/C is always on -- A/C mode always commanded on | Refer to the Pinpoint Test | GO to Pinpoint Test E |
| The A/C is inoperative | Refer to the Pinpoint Test | GO to Pinpoint Test G |
| The A/C pressure relief valve is discharging | High system pressure A/C pressure relief valve |
Using the manifold gauge set, CHECK the A/C system pressure. If the system pressure is above the A/C pressure relief valve open pressure, 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, INSTALL a new A/C compressor. REFER to: Air Conditioning (A/C) Compressor . |
| In-Vehicle Temperature And Humidity Sensor Not Operating Properly | Refer to the Pinpoint Test | GO to Pinpoint Test L |
| The air inlet door is inoperative | Refer to the Pinpoint Test | GO to Pinpoint Test J |
| The blower motor is inoperative | Refer to the Pinpoint Test | GO to Pinpoint Test N |
| The blower motor does not operate correctly | Refer to the Pinpoint Test | GO to Pinpoint Test O |
| Incorrect or erratic direction of airflow from outlets | Refer to the Pinpoint Test | GO to Pinpoint Test I |
| Insufficient, erratic or no heat | Refer to the Pinpoint Test | GO to Pinpoint Test M |
| Reduced outlet airflow | Plugged cabin air filter | Inspect the cabin air filter. REFER to: Cabin Air Filter . If OK, DIAGNOSE for low refrigerant charge, AC always commanded on or blower motor not operating correctly. |
| Improper refrigerant level | PERFORM the refrigerant system tests. REFER to: Refrigerant System Tests . If refrigerant charge is OK, GO to Pinpoint Test E | |
| Blower motor | GO to Pinpoint Test O | |
| The temperature control is inoperative or does not operate correctly | Refer to the Pinpoint Test | GO to Pinpoint Test I |
| Unable to duplicate the customer concern and no Diagnostic Trouble Codes (DTCs) present | Refer to the Pinpoint Test | GO to Pinpoint Test R |