Symptom Chart - Climate Control Systems

WARNING: This page is about a different car, the 2019 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.

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 DTC Chart: PCM

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

Symptom Chart

Condition	Possible Sources	Actions
A module does not respond to the diagnostic scan tool	Fuse 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 C
Insufficient Air Conditioning (A/C) cooling	Improper refrigerant level	CARRY OUT the refrigerant system tests. REFER to: Refrigerant System Tests . If OK, DIAGNOSE for a temperature door actuator not operating correctly.
Insufficient Air Conditioning (A/C) cooling	Temperature door actuator	For inadequate temperature out of the LH side, GO to Pinpoint Test M For inadequate temperature out of the RH side, GO to Pinpoint Test F
The A/C is always on -- A/C mode always commanded on	Refer to the Pinpoint Test	GO to Pinpoint Test L
The A/C is inoperative	Refer to the Pinpoint Test	GO to Pinpoint Test K
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 .
The air inlet door is inoperative	Refer to the Pinpoint Test	GO to Pinpoint Test H
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 J
Insufficient heat in Auto Start-Stop mode only	Refer to the Pinpoint Test	GO to Pinpoint Test U
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: Refrigerant System Tests . If refrigerant charge is OK, GO to Pinpoint Test L
	Blower motor	GO to Pinpoint Test O
The temperature control is inoperative or does not operate correctly - LH	Refer to the Pinpoint Test	GO to Pinpoint Test M
The temperature control is inoperative or does not operate correctly - RH	Refer to the Pinpoint Test	GO to Pinpoint Test F
Unable to duplicate the customer concern and no Diagnostic Trouble Codes (DTCs) present	Refer to the Pinpoint Test	GO to Pinpoint Test G
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.