Symptom Chart: Climate Control - EMTC

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to SERVICE INFORMATION for information regarding Ford-specific diagnostic practices.

Condition	Possible Sources	Actions
No communication with the HVAC module	Fuse(s) Wiring, terminals or connectors HVAC system and/or related components	Go to PINPOINT TEST J .
Climate control system functional test	HVAC system and/or related components	Go to PINPOINT TEST G .
Reduced outlet airflow	Wiring, terminals or connectors A/C compressor clutch air gap A/C pressure transducer Evaporator temperature sensor A/C clutch relay Blower motor Blower motor control PCM	Go to PINPOINT TEST G .
The air inlet door is inoperative	Wiring, terminals or connectors Air inlet mode door actuator Air inlet mode door binding or stuck HVAC module FCIM	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 G .
Insufficient, erratic or no heat	Missing or broken engine coolant hose check valve or incorrect orientation of check valve (3.5L only) Low engine coolant level Plugged or partially plugged heater core Temperature blend door(s) binding or stuck Temperature blend door actuator(s) HVAC module	Go to PINPOINT TEST G .
The A/C is inoperative	Fuse(s) Wiring, terminals or connectors A/C system discharged/low charge A/C system discharged/low charge HVAC module PCM 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 G .
The A/C operation is erratic. The discharge air warms up when the vehicle comes to a stop.	Engine cooling fan relay Engine cooling fan PCM	DIAGNOSE all PCM DTCs before proceeding. Refer to ELECTRONIC ENGINE CONTROLS . If no PCM DTCs are present, go to PINPOINT TEST Y .
The 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 temperature sensor	Go to PINPOINT TEST G .
The A/C is always on - A/C mode always commanded ON	Wiring, terminals or connectors HVAC module PCM FCIM	Go to PINPOINT TEST G .
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 FCIM	Go to PINPOINT TEST G .
The blower motor is inoperative	Fuse(s) Wiring, terminals or connectors Blower motor relay Blower motor HVAC module Blower motor speed control FCIM	Go to PINPOINT TEST G .
The blower motor does not operate correctly	Wiring, terminals or connectors Blower motor speed control HVAC module FCIM	Go to PINPOINT TEST G .
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, INSTALL a new A/C compressor. Refer to AIR CONDITIONING (A/C) COMPRESSOR - 3.5L Ti-VCT or Refer to AIR CONDITIONING (A/C) COMPRESSOR - 2.0L GTDI or Air Conditioning (A/C) Compressor - 3.5L GTDI . If the system pressure is above the A/C pressure relief valve open pressure, REPAIR the system for a restriction.