Symptom Chart - Climate Control Systems

WARNING: This page is about a different car, the 2016 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

Condition	Possible Sources	Action
NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) .
No communication with the HVAC control module	Fuse Wiring, terminals or connectors Communication network HVAC control module	REFER to Module Communications Network .
Externally Controlled Variable Displacement Compressor (EVDC) poor performance/does not operate correctly	Refer to the Pinpoint Test	GO to Pinpoint Test Z .
Unable to duplicate the customer concern and no DTCs present	Refer to the Pinpoint Test	GO to Pinpoint Test H .
The HVAC functions are inoperative/do not operate correctly from touchscreen only	Communication network FCDIM	REFER to Information and Entertainment Systems - 4.2-Inch (107 mm) Screen, 4 Or 6 Speakers or Information and Entertainment Systems - 8-Inch (203 mm) Touchscreen, 7 Speakers Symptom Chart and DIAGNOSE the touchscreen.
The air inlet door is inoperative	Refer to the Pinpoint Test	GO to Pinpoint Test I .
Incorrect/erratic direction of airflow from outlets	Refer to the Pinpoint Test	GO to Pinpoint Test J .
Reduced outlet airflow	Refer to the Pinpoint Test	If the A/C compressor does not cycle, GO to Pinpoint Test M . If the A/C compressor cycles normally, GO to Pinpoint Test R .
Insufficient, erratic or no heat	Refer to the Pinpoint Test	GO to Pinpoint Test K .
The A/C is inoperative	Refer to the Pinpoint Test	GO to Pinpoint Test L .
The A/C operation is erratic. The discharge air warms up when the vehicle comes to a stop.	Refer to the Pinpoint Test	DIAGNOSE all PCM DTCs before proceeding. REFER to the PCM DTC Chart . If no PCM DTCs are present GO to Pinpoint Test X .
The A/C is always on - A/C compressor does not cycle	Refer to the Pinpoint Test	GO to Pinpoint Test M .
The A/C is always on - A/C mode always commanded ON	Refer to the Pinpoint Test	GO to Pinpoint Test N .
Temperature control is inoperative/does not operate correctly	Refer to the Pinpoint Test	For driver side temperature concern, GO to Pinpoint Test O . For passenger side temperature concern, GO to Pinpoint Test P .
The blower motor is inoperative	Refer to the Pinpoint Test	GO to Pinpoint Test Q .
The blower motor does not operate correctly	Refer to the Pinpoint Test	GO to Pinpoint Test R .
A/C pressure relief valve discharging	High system pressure A/C pressure relief valve	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 Climate Control . If the system pressure is above the A/C pressure relief valve open pressure, REPAIR the system for a restriction.