Symptom Chart - Climate Control Systems

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. 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, Description and Operation Service Information .

Condition	Possible Sources	Action
NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the PCM DTC Chart.
No communication with the HVAC control module	HVAC control module Communication network	REFER to Module Communications Network .
Unable to duplicate the customer concern and no DTCs present	Refer to Pinpoint Test	GO to Pinpoint Test I .
Reduced outlet airflow	Plugged cabin air filter	Inspect the cabin air filter. If OK, DIAGNOSE for low refrigerant charge, A/C always commanded on or blower motor not operating correctly.
Reduced outlet airflow	Improper refrigerant level	CARRY OUT the refrigerant system tests. Refrigerant System Tests If refrigerant charge is OK, GO to Pinpoint Test Q .
Reduced outlet airflow	Blower motor	GO to Pinpoint Test X .
The air inlet door is inoperative	Refer to Pinpoint Test	For EMTC, GO to Pinpoint Test J . For EATC, GO to Pinpoint Test K .
Incorrect/erratic direction of airflow from outlets	Refer to Pinpoint Test	For EMTC, GO to Pinpoint Test L . For EATC, GO to Pinpoint Test M .
Insufficient, erratic or no heat	Refer to Pinpoint Test	GO to Pinpoint Test N .
Insufficient A/C cooling	Improper refrigerant level Temperature door actuator	CARRY OUT the refrigerant system tests. Refrigerant System Tests If OK, DIAGNOSE for a temperature blend door actuator not operating correctly. For inadequate temperature out of the EMTC, GO to Pinpoint Test R . For inadequate temperature out of the single zone EATC, GO to Pinpoint Test S . For inadequate temperature out of the EATC, dual zone driver side, GO to Pinpoint Test U . For inadequate temperature out of the EATC, dual zone passenger side, GO to Pinpoint Test V .
The air conditioning (A/C) is inoperative	Refer to Pinpoint Test	GO to Pinpoint Test O .
The air conditioning (A/C) is always on - A/C mode always commanded ON	Refer to Pinpoint Test	GO to Pinpoint Test Q .
Temperature control is inoperative/does not operate correctly - EMTC	Refer to Pinpoint Test	GO to Pinpoint Test R .
Temperature control is inoperative/does not operate correctly - single zone EATC	Refer to Pinpoint Test	GO to Pinpoint Test S .
Temperature control is inoperative/does not operate correctly - dual zone driver side EATC	Refer to Pinpoint Test	GO to Pinpoint Test U .
Temperature control is inoperative/does not operate correctly - dual zone passenger side EATC	Refer to Pinpoint Test	GO to Pinpoint Test V .
The blower motor is inoperative - EMTC	Refer to Pinpoint Test	GO to Pinpoint Test W .
The blower motor does not operate correctly - EMTC	Refer to Pinpoint Test	GO to Pinpoint Test X .
The blower motor is inoperative - EATC	Refer to Pinpoint Test	GO to Pinpoint Test Y .
The blower motor does not operate correctly - EATC	Refer to Pinpoint Test	GO to Pinpoint Test Z .
The auxiliary blower motor is inoperative	Refer to Pinpoint Test	GO to Pinpoint Test AA .
The auxiliary blower motor does not operate correctly	Refer to Pinpoint Test	GO to Pinpoint Test AB .
The auxiliary temperature control is inoperative/does not operate correctly using the front/rear auxiliary climate controls	Refer to Pinpoint Test	GO to Pinpoint Test AC .
The auxiliary panel/floor control is inoperative/does not operate correctly using the front/rear auxiliary climate controls	Refer to Pinpoint Test	GO to Pinpoint Test AD .
The auxiliary temperature, panel/floor and blower motor controls are inoperative/do not operate correctly using the rear auxiliary climate controls	Refer to Pinpoint Test	GO to Pinpoint Test AE .
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, REPLACE the A/C pressure relief valve. If the system pressure is above the A/C pressure relief valve open pressure, REPAIR the 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 - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description or EMTC REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description VERIFY module communications network operation. DIAGNOSE Diagnostic Trouble Codes (DTCs) if present.