Symptom Chart - Climate Control Systems

WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

CLIMATE CONTROL SYSTEMS SYMPTOM CHART

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 module	HVAC module Communication network	REFER to MODULE COMMUNICATIONS NETWORK .
Unable to duplicate the customer concern and no DTCs present	HVAC system and/or related components	GO to PINPOINT TEST I .
Reduced outlet airflow	Wiring, terminals or connectors A/C compressor clutch air gap A/C evaporator temperature sensor A/C clutch relay Blower motor control Blower motor resistor PCM HVAC module FCIM	If the A/C compressor does not cycle, GO to PINPOINT TEST P . For EMTC base with 4 blower motor speed positions, if the A/C compressor cycles normally, GO to PINPOINT TEST X . For other systems, if the A/C compressor cycles normally, GO to PINPOINT TEST Z .
The air inlet door is inoperative	Wiring, terminals or connectors Air inlet mode door actuator Stuck or bound linkage or door HVAC module FCIM	For EMTC base with 4 blower motor speed positions, GO to PINPOINT TEST J . For other systems, GO to PINPOINT TEST K .
Incorrect/erratic direction of airflow from outlets	Wiring, terminals or connectors Defrost/panel/floor mode door actuator Stuck or bound linkage or door HVAC module FCIM	For EMTC base with 4 blower motor speed positions, GO to PINPOINT TEST L . For other systems, GO to PINPOINT TEST M .
Insufficient, erratic or no heat	Low engine coolant level Plugged or partially plugged heater core Temperature blend door(s) binding or stuck Temperature blend door actuator(s)	GO to PINPOINT TEST N .
Insufficient A/C cooling	Improper refrigerant level Temperature blend door(s) binding or stuck Temperature blend door actuator(s)	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 base with 4 blower motor speed positions, GO to PINPOINT TEST R . For inadequate temperature out of the EMTC with 4.2 inch display with 7 blower motor speed positions, 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	Fuse(s) Wiring, terminals or connectors A/C system discharged/low charge PCM HVAC module FCIM A/C clutch relay A/C compressor clutch air gap A/C pressure transducer Evaporator temperature sensor A/C compressor clutch field coil	GO to PINPOINT TEST O .
The air conditioning (A/C) is always on - A/C compressor does not cycle	Wiring, terminals or connectors PCM Evaporator temperature sensor A/C clutch relay A/C compressor clutch air gap	GO to PINPOINT TEST P .
The air conditioning (A/C) is always on - A/C mode always commanded ON	Wiring, terminals or connectors PCM FCIM HVAC module	GO to PINPOINT TEST Q .
Temperature control is inoperative/does not operate correctly - EMTC base with 4 blower motor speed positions	Wiring, terminals or connectors HVAC module Stuck or bound linkage or door Temperature blend door actuator	GO to PINPOINT TEST R .
Temperature control is inoperative/does not operate correctly - EMTC with 4.2 inch display with 7 blower motor speed positions	Wiring, terminals or connectors HVAC module Stuck or bound linkage or door Temperature blend door actuator	GO to PINPOINT TEST S .
Temperature control is inoperative/does not operate correctly - EATC , dual zone driver side	Wiring, terminals or connectors HVAC module Stuck or bound linkage or door Temperature blend door actuator FCIM	GO to PINPOINT TEST U .
Temperature control is inoperative/does not operate correctly - EATC , dual zone passenger side	Wiring, terminals or connectors HVAC module Stuck or bound linkage or door Temperature blend door actuator FCIM	GO to PINPOINT TEST V .
The blower motor is inoperative - EMTC base with 4 blower motor speed positions	Fuse(s) Wiring, terminals or connectors Blower motor relay Blower motor HVAC module	GO to PINPOINT TEST W .
The blower motor does not operate correctly - EMTC base with 4 blower motor speed positions	Wiring, terminals or connectors Blower motor resistor HVAC module	GO to PINPOINT TEST X .
The blower motor is inoperative - EATC dual zone and EMTC with 4.2 inch display with 7 blower motor speed positions	Fuse(s) Wiring, terminals or connectors Blower motor relay Blower motor HVAC module Blower motor speed control	GO to PINPOINT TEST Y .
The blower motor does not operate correctly - EATC dual zone and EMTC with 4.2 inch display with 7 blower motor speed positions	Wiring, terminals or connectors Blower motor speed control HVAC module FCIM	GO to PINPOINT TEST Z .
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.