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Ford Focus Service Manual: Climate Control System - General Information and Diagnostics

Ford Focus Service Manual / HVAC / General Information / Climate Control System - General Information and Diagnostics

Climate Control System Operation

WARNING: Take the following
precautions when repairing an air conditioning system containing R-134a:

Failure to follow these instructions may result in serious personal injury.

NOTICE: To avoid damaging the vehicle or Air Conditioning (A/C) components, the following precautions must be observed.

NOTICE: To avoid contamination of the Air Conditioning (A/C) system, the following precautions must be observed.

The system consists of the following components:

HVAC System

The HVAC system heats or cools the vehicle depending on the HVAC control panel selection.

The HVAC system operation is determined by the settings on the climate control module. The HVAC system is composed of the HVAC module, blower motor resistor, mode door actuator, air inlet door actuator and temperature blend door actuator to control the various functions.

The blower motor switch:

The A/C request button:

The function selector:

The temperature selector:

The air recirculation button:

The HVAC module also includes:

External Temperature Display

While the actual external temperature can vary continuously, the value that is displayed will update at a specific rate depending on whether or not the engine is "hot" and whether or not the vehicle is moving.

When the external temperature is rising, the display will update slowly.

Updates (when the actual external temperature is higher than currently displayed value) will be limited to 0.6°C (1°F) every 20 seconds while the vehicle is moving at greater than 40 km/h (25 mph) for more than 90 seconds or 0.6°C (1°F) every 20 minutes if the vehicle is not moving at this speed. This is to prevent the heat from the engine compartment from affecting the accuracy of the display.

When the external temperature is dropping, the display will update quickly.

Updates (when the actual external temperature is lower than currently displayed value) will only be limited to 0.6°C (1°F) every 2 seconds (regardless of vehicle speed). Consequently the display will essentially follow the drop experienced by the external temperature thermistor.

System Airflow Description

Max A/C

When MAX A/C is selected:

PANEL

When PANEL is selected:

PANEL/FLOOR

When PANEL/FLOOR is selected:

OFF

When OFF is selected:

FLOOR

When FLOOR is selected:

FLOOR/DEFROST

When the FLOOR/DEFROST is selected:

DEFROST

When DEFROST is selected:

General Information
...

Control Components
Electronic Manual Temperature Control (EMTC) The HVAC module allows the vehicle occupants to select the following: Air inlet source (outside or recirculated) Blower motor speed Discharge ...

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