Symptom Chart - Climate Control System

WARNING: This page is about a different car, the 2013 Ford Fiesta. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the PCM DTC Chart .

SYMPTOM CHART - CLIMATE CONTROL SYSTEM

Condition	Possible Sources	Action
All HVAC functions inoperative	Fuse Wiring, terminals or connectors HVAC module	Go to Pinpoint Test P .
Unable to duplicate the customer concern and no DTCs present	Incorrect functioning of the HVAC system and/or related components	Go to Pinpoint Test F .
Reduced outlet airflow	Wiring, terminals or connectors A/C compressor clutch air gap A/C pressure transducer Evaporator discharge air temperature sensor A/C clutch relay Blower motor Blower motor resistor HVAC module PCM	If the vehicle is not equipped with A/C, Go to Pinpoint Test O If the A/C compressor is engaged and does not cycle, Go to Pinpoint Test K . If the A/C compressor cycles normally, Go to Pinpoint Test O .
The air inlet door is inoperative	Wiring, terminals or connectors Air inlet mode door actuator Air inlet mode door binding or stuck HVAC module	Go to Pinpoint Test G .
Incorrect/erratic direction of airflow from outlets	Wiring, terminals or connectors Defrost/panel/floor mode door actuator Defrost/panel/floor mode door binding or stuck HVAC module	Go to Pinpoint Test H .
Insufficient, erratic or no heat	Low engine coolant level Plugged or partially plugged heater core Temperature blend door binding or stuck Temperature blend door actuator	Go to Pinpoint Test I .
The air conditioning (A/C) is inoperative	Fuse(s) Wiring, terminals or connectors A/C system discharged/low charge PCM HVAC module A/C clutch relay A/C compressor clutch air gap A/C pressure transducer Evaporator discharge air temperature sensor A/C compressor clutch field coil	Go to Pinpoint Test J .
The air conditioning (A/C) is always on - A/C compressor does not cycle	Wiring, terminals or connectors PCM A/C clutch relay A/C compressor clutch air gap Evaporator discharge air temperature sensor	Go to Pinpoint Test K .
The A/C is always on - A/C mode always commanded ON	Wiring, terminals or connectors HVAC module PCM	Go to Pinpoint Test L .
Temperature control is inoperative/does not operate correctly	Wiring, terminals or connectors HVAC module Temperature blend door is binding or stuck Temperature blend door actuator	Go to Pinpoint Test M .
The blower motor is inoperative	Fuse(s) Wiring, terminals or connectors HVAC module Blower motor relay Blower motor	Go to Pinpoint Test N .
The blower motor does not operate correctly	Wiring, terminals or connectors A/C blower motor resistor HVAC module	Go to Pinpoint Test O .
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.