Symptom Chart: Climate Control - Dual Automatic Temperature Control (DATC)

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .

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 DTC Chart: Powertrain Control Module (PCM) .

Condition	Possible Sources	Actions
A module does not communicate with the diagnostic scan tool	Fuse(s) Wiring, terminals or connectors FCIM	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 T
Unable To Duplicate The Customer Concern And No Diagnostic Trouble Codes (DTCs) Present	Refer to Pinpoint Test	GO to Pinpoint Test C
HVAC functions are inoperative/do not operate correctly from touchscreen only	Communication network FCIM APIM	Refer to the appropriate Information and Entertainment Systems article for the procedure.
Reduced outlet airflow	Plugged cabin air filter	INSPECT the cabin air filter. REFER to: Cabin Air Filter . If OK, DIAGNOSE for low refrigerant charge, A/C always commanded on or blower motor not operating correctly.
	Improper refrigerant level	CARRY OUT the refrigerant system tests. REFER to the appropriate GENERAL PROCEDURES . If OK, DIAGNOSE for a temperature door actuator not operating correctly. If refrigerant charge is OK, GO to Pinpoint Test H
	Blower motor	GO to Pinpoint Test L
The air inlet door is inoperative	Refer to Pinpoint Test	GO to Pinpoint Test D
Incorrect or erratic direction of airflow from outlets - front	Refer to Pinpoint Test	GO to Pinpoint Test E
Incorrect or erratic direction of airflow from outlets - rear	Refer to Pinpoint Test	GO to Pinpoint Test W
Insufficient, erratic or no heat	Refer to Pinpoint Test	GO to Pinpoint Test F
Insufficient heat in Auto Start-Stop mode only	Refer to Pinpoint Test	GO to Pinpoint Test S
The A/C is inoperative	Refer to Pinpoint Test	GO to Pinpoint Test G
The A/C is always on - A/C mode always commanded ON	Refer to Pinpoint Test	GO to Pinpoint Test H
Temperature control is inoperative or does not operate correctly - driver side	Refer to Pinpoint Test	GO to Pinpoint Test I
Temperature control is inoperative or does not operate correctly - passenger side	Refer to Pinpoint Test	GO to Pinpoint Test J
Temperature control is inoperative or does not operate correctly - rear	Refer to Pinpoint Test	GO to Pinpoint Test X
The front blower motor is inoperative	Refer to Pinpoint Test	GO to Pinpoint Test K
The front blower motor does not operate correctly	Refer to Pinpoint Test	GO to Pinpoint Test L
The rear blower motor is inoperative	Refer to Pinpoint Test	GO to Pinpoint Test U
The rear blower motor does not operate correctly	Refer to Pinpoint Test	GO to Pinpoint Test V
Insufficient A/C cooling	Improper refrigerant level	CARRY OUT the refrigerant system tests. REFER to the appropriate Refrigerant System Tests in GENERAL PROCEDURES . If OK, DIAGNOSE for a temperature door actuator not operating correctly.
Insufficient A/C cooling	Temperature door actuator	For inadequate temperature out of the driver side, GO to Pinpoint Test I For inadequate temperature out of the passenger side, GO to Pinpoint Test J
A/C pressure relief valve discharging	A/C pressure relief valve	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 GENERAL PROCEDURES .
A/C pressure relief valve discharging	High system pressure	CHECK the high side 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 A/C system for a restriction.
Climate control does not operate only when remote start is used	IPC information display settings Non-Ford approved remote start system installed	VERIFY Remote Start - Message Center Set To Auto, or Remote Start - Message Center Set To Last User Settings. REFER to: Climate Control System - System Operation and Component Description . VERIFY module communications network operation. DIAGNOSE Diagnostic Trouble Codes (DTCs) if present. REFER to: Communications Network .