Part 2
Climate Control - DATC
Component Location
MyTemp
The MyTemp feature can be used to store and recall a preset driver's temperature. This feature is provided so this temperature can be quickly adjusted to a frequently used setting with a single button press. For additional information about MyTemp, refer to the Owner's Literature.
Remote Start - Message Center Set To Auto
This vehicle is equipped with a remote start feature. In addition to being able to start the vehicle remotely, the remote start feature also utilizes other vehicle systems to increase the level of comfort to the vehicle occupants upon entering the vehicle. For additional information on the remote start feature and the other vehicle systems it utilizes, REFER to Remote Start Starting System - without Intelligent Access (IA) (vehicles without IA (Intelligent Access)) or REFER to Remote Start Starting System - with Intelligent Access (IA) (vehicles with IA (Intelligent Access)).
When the remote start feature is used, the climate control system automatically sets certain parameters in an attempt to achieve a comfortable cabin temperature. These parameters are set based on outside air temperature. During remote start, the outside air temperature is continually evaluated and HVAC (Heating, Ventilation, and Air Conditioning) system behavior can change if the outside air changes between cold, moderate and warm temperatures.
For cold ambient air temperatures as determined by the HVAC (Heating, Ventilation, and Air Conditioning) module AUTO mode to request heat:
- the airflow mode is set to AUTO if Front Defrost is set to Off in the message center. (if the HVAC (Heating, Ventilation, and Air Conditioning) module requests FLOOR in AUTO mode, FLOOR/DEFROST will be used in remote start mode).
- the airflow mode is set to DEFROST if Front Defrost is set to Auto in the message center.
- the temperature is set to 22 C (71.6 F).
- the blower speed is set to AUTO.
- the air inlet mode is set to AUTO.
- A/C (Air Conditioning) is set to AUTO.
For moderate and warm ambient air temperatures as determined by the HVAC (Heating, Ventilation, and Air Conditioning) module AUTO mode to request heat or cooling:
- the airflow mode is set to AUTO.
- the temperature is set to 22 C (71.6 F).
- the blower speed is set to AUTO.
- the air inlet mode is set to AUTO.
- A/C (Air Conditioning) is set to AUTO.
Remote Start - Message Center Set To Last User Settings
This vehicle is equipped with a remote start feature. In addition to being able to start the vehicle remotely, the remote start feature also utilizes other vehicle systems to increase the level of comfort to the vehicle occupants upon entering the vehicle. For additional information on the remote start feature and the other vehicle systems it utilizes, REFER to Remote Start Starting System - without Intelligent Access (IA) (vehicles without IA (Intelligent Access)) or REFER to Remote Start Starting System - with Intelligent Access (IA) (vehicles with IA (Intelligent Access)).
When the remote start feature is used, the climate control system automatically sets certain parameters in an attempt to achieve a comfortable cabin temperature. These parameters are set based on outside air temperature. During remote start, the outside air temperature is continually evaluated and HVAC (Heating, Ventilation, and Air Conditioning) system behavior can change if the outside air changes between cold, moderate and warm temperatures.
For cold ambient air temperatures as determined by the HVAC (Heating, Ventilation, and Air Conditioning) module AUTO mode to request heat:
- the airflow mode is set to the last user setting if Front Defrost is set to Off in the message center.
- the airflow mode is set to DEFROST if Front Defrost is set to Auto in the message center.
- the temperature is set to the last user setting.
- the blower speed is set to the last user setting.
- the air inlet mode is set to the last user setting.
- A/C (Air Conditioning) is set to the last user setting.
For moderate and warm ambient air temperatures as determined by the HVAC (Heating, Ventilation, and Air Conditioning) module AUTO mode to request heat or cooling:
- the airflow mode is set to the last user setting.
- the temperature is set to the last user setting.
- the blower speed is set to the last user setting.
- the air inlet mode is set to the last user setting.
- A/C (Air Conditioning) is set to the last user setting.
Component Description
Heating Ventilation Air Conditioning (HVAC) Module - Dual Automatic Temperature Control (DATC)
The DATC (Dual Automatic Temperature Control) system uses a remote HVAC (Heating, Ventilation, and Air Conditioning) module that is separate from the control interface. For details on the HVAC (Heating, Ventilation, and Air Conditioning) module communication, REFER to Control System Logic.
The HVAC (Heating, Ventilation, and Air Conditioning) module also controls the outputs for the interior ambient lighting, rear window defrost and heated seats.
The HVAC (Heating, Ventilation, and Air Conditioning) module utilizes an FET (Field-Effect Transistor) protective circuit strategy for its actuator outputs. Output load (current level) is monitored for excessive current (typically short circuits) and is shut down (turns off the voltage or ground provided by the module) when a fault event is detected. A short circuit DTC (Diagnostic Trouble Code) is stored at the fault event and a cumulative counter is started.
When the demand for the output is no longer present, the module resets the FET (Field-Effect Transistor) circuit protection to allow the circuit to function. The next time the driver requests a circuit to activate that has been shut down by a previous short ( FET (Field-Effect Transistor) protection) and the circuit is still shorted, the FET (Field-Effect Transistor) protection shuts off the circuit again and the cumulative counter advances.
When the excessive circuit load occurs often enough, the module shuts down the output until a repair procedure is carried out. The FET (Field-Effect Transistor) protected circuit has 3 predefined levels of short circuit tolerance based on the harmful effect of each circuit fault on the FET (Field-Effect Transistor) and the ability of the FET (Field-Effect Transistor) to withstand it. A module lifetime level of fault events is established based upon the durability of the FET (Field-Effect Transistor). If the total tolerance level is determined to be 600 fault events, the 3 predefined levels would be 200, 400 and 600 fault events.
When each tolerance level is reached, the short circuit DTC (Diagnostic Trouble Code) that was stored on the first failure cannot be cleared by a command to clear the DTCs (Diagnostic Trouble Codes). The module does not allow the DTC (Diagnostic Trouble Code) to be cleared or the circuit to be restored to normal operation until a successful self-test proves that the fault has been repaired. After the self-test has successfully completed (no on-demand DTCs (Diagnostic Trouble Codes) present), DTC (Diagnostic Trouble Code) U1000:00 and the associated DTC (Diagnostic Trouble Code) (the DTC (Diagnostic Trouble Code) related to the shorted circuit) automatically clears and the circuit function returns.
When each level is reached, the DTC (Diagnostic Trouble Code) associated with the short circuit sets along with DTC (Diagnostic Trouble Code) U1000:00. These DTCs (Diagnostic Trouble Codes) can be cleared using the module self-test, then the Clear DTC (Diagnostic Trouble Code) operation on the scan tool. The module never resets the fault event counter to zero and continues to advance the fault event counter as short circuit fault events occur.
If the number of short circuit fault events reach the third level, then DTCs (Diagnostic Trouble Codes) U1000:00 and U3000:49 set along with the associated short circuit DTC (Diagnostic Trouble Code). DTC (Diagnostic Trouble Code) U3000:49 cannot be cleared and a new module must be installed after the repair.
The HVAC (Heating, Ventilation, and Air Conditioning) requires PMI (Programmable Module Installation) when it is replaced.
Air Conditioning (AC) Pressure Transducer
The PCM (Powertrain Control Module) monitors the discharge pressure measured by the A/C (Air Conditioning) pressure transducer. As the refrigerant pressure changes, the resistance of the A/C (Air Conditioning) pressure transducer changes. It is not necessary to recover the refrigerant before removing the A/C (Air Conditioning) pressure transducer.
In-Vehicle Temperature and Humidity Sensor
The in-vehicle temperature and humidity sensor sensor contains 2 thermistors which measure the in-vehicle air temperature and sends that reading to the HVAC (Heating, Ventilation, and Air Conditioning) module. The aspirator hose uses airflow through the heater core and evaporator core housing to create a venturi-type suction to draw in-vehicle air through the in-vehicle temperature and humidity sensor (across the thermistors).
Autolamp-Sunload Sensor
The autolamp/sunload sensor supplies information to the HVAC (Heating, Ventilation, and Air Conditioning) module indicating the intensity of the sun on the vehicle.
Evaporator Temperature Sensor
The evaporator discharge air temperature sensor contains a thermistor. The sensor varies its resistance with the temperature. As the temperature rises, the resistance falls. As the temperature falls, the resistance rises.
Defrost-Panel-Floor Mode Door Actuator
The defrost/panel/floor mode door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the HVAC (Heating, Ventilation, and Air Conditioning) module to monitor the position of the airflow mode door.
LH Temperature Blend Door Actuator
The temperature blend door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the HVAC (Heating, Ventilation, and Air Conditioning) module to monitor the position of the temperature blend door.
RH Temperature Blend Door Actuator
The temperature blend door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the HVAC (Heating, Ventilation, and Air Conditioning) module to monitor the position of the temperature blend door.
Air Inlet Mode Door Actuator
The air inlet mode door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the HVAC (Heating, Ventilation, and Air Conditioning) module to monitor the position of the air inlet mode door.
Blower Motor Speed Control
The HVAC (Heating, Ventilation, and Air Conditioning) module sends a PWM (Pulse Width Modulated) signal to the blower motor speed control to control the blower speed. The blower speed control provides variable ground feed for the blower motor to control the speed. A delay function provides a gradual increase or decrease in blower motor speed under all conditions.
Air Conditioning (AC) Compressor Clutch
When battery voltage is applied to the A/C (Air Conditioning) compressor clutch field coil, the magnetic force locks the clutch plate and hub assembly and the A/C (Air Conditioning) clutch pulley together as one unit, causing the compressor shaft to rotate.
Air Conditioning (AC) Compressor
The A/C (Air Conditioning) compressor has the following characteristics:
- A non-serviceable shaft seal.
- A pressure relief valve installed in the rear of the compressor to protect the refrigerant system against excessively high refrigerant pressures.
- The A/C (Air Conditioning) compressor uses PAG (Polyalkylene Glycol) oil or equivalent. This oil contains special additives required for the A/C (Air Conditioning) compressor.
- The A/C (Air Conditioning) compressor oil may have some slightly dark-colored streaks while maintaining normal oil viscosity. This is normal for this A/C (Air Conditioning) compressor because of break-in wear that can discolor the oil.
- Use the oil adding procedure specified for this vehicle when installing a new A/C (Air Conditioning) compressor. REFER to Refrigerant Oil Adding Refrigerant Oil Adding
Air Conditioning (AC) Condenser
The A/C (Air Conditioning) condenser is an aluminum fin-and-tube design heat exchanger.
The receiver/drier is integral to the A/C (Air Conditioning) condenser.
Evaporator Core
The evaporator core is an aluminum plate/fin type and is located in the heater core and evaporator core housing.
Application of an A/C (Air Conditioning) deodorizer or cooling coil coating product to the evaporator core is not approved by Ford Motor Company for this vehicle. Application of an A/C (Air Conditioning) deodorizer or cooling coil coating may interfere with the anti-microbial coating applied to the evaporator core at the factory, or the efficiency of the evaporator core.
Thermostatic Expansion Valve (TXV)
The TXV (Thermostatic Expansion Valve) is located at the evaporator core inlet and outlet tubes. The TXV (Thermostatic Expansion Valve) provides a restriction to the flow of refrigerant from the high-pressure side of the refrigerant system and separates the low-pressure and high-pressure sides of the refrigerant system.
Receiver-Drier
The receiver/drier is incorporated onto the LH (Left Hand) side of the A/C (Air Conditioning) condenser. It stores high-pressure liquid refrigerant after it leaves the condenser core. The receiver/drier is designed to remove moisture and contaminants from the refrigerant system. The receiver/drier desiccant bag is a separate component and can be separately removed and installed with the A/C (Air Conditioning) condenser removed from the vehicle.
The A/C (Air Conditioning) condenser for this vehicle is produced from the factory with a receiver/drier desiccant bag installed in the integrated receiver/drier. This receiver/drier desiccant bag may become contaminated with moisture if the A/C (Air Conditioning) condenser is not installed for an extended period of time. Since it cannot be determined how much time has elapsed between production and installation of the unit as a service part, remove and replace the receiver/drier desiccant bag with the separate receiver/drier desiccant bag supplied with the A/C (Air Conditioning) condenser service part kit.
Service Gauge Port Valves
The service gauge port fitting is an integral part of the refrigerant line or component.
- Special couplings are required for both the high-side and low-side service gauge ports.
- A very small amount of leakage is always detectable around the Schrader-type valve with the service gauge port valve cap removed, and is considered normal. A new Schrader-type valve core can be installed if the seal leaks excessively.
- The A/C (Air Conditioning) service gauge port valve caps are used as primary seals in the refrigerant system to prevent leakage through the Schrader-type valves from reaching the atmosphere. Always install and tighten the A/C (Air Conditioning) service gauge port valve caps to the correct torque after they are removed.
Refrigerant System Dye
A fluorescent refrigerant system dye wafer is added to the receiver/drier desiccant bag to assist in refrigerant system leak diagnosis using a Rotunda-approved UV (Ultra-violet) blacklight. This fluorescent dye wafer dissolves after about 30 minutes of continued A/C (Air Conditioning) operation. It is not necessary to add additional dye to the refrigerant system before diagnosing leaks, even if a significant amount of refrigerant has been removed from the system. Additional refrigerant system dye should only be added if more than 50% of the refrigerant system lubricant capacity has been lost due to a fitting separation or hose rupture.
Cabin Air Filter
The vehicle is factory equipped with a cabin air filter. The cabin air filter is positioned at the blower motor inlet and filters both fresh and recirculated air.
A cabin air filter must be installed at all times to prevent foreign objects from entering the system. Running the system without a filter in place could result in degradation or damage to the system. The cabin air filter must be installed for correct climate control system NVH (Noise, Vibration, or Harshness) performance.
Access the cabin air filter by removing the glove compartment and the cabin air filter access cover.