HVAC 13 1.1.5. COMPONENTS OF HVAC 1.1.5.1. CONTROL PANEL NOTE The removal and installation of all components are covered in “On Vehicle Repairs” in this section. MANUAL HVAC CONTROL PANEL ROTARY KNOBS A Air Distribution Control B Blower Speed Control C Temperature Selection PUSH BUTTONS D Fresh / Recirculation Air Mode E AC On / Off The HVAC control panel consists of 3 rotary knobs & 2 Push buttons that can be used to set the required temperature inside the cabin. In addition to this the control panel also acts as a control unit for the HVAC system in which all the software calibrations are embedded. A. AIR DISTRIBUTION CONTROL The mode knob is used to select the air delivery mode. There are 5 different modes as given below. Chest Mode Chest – Leg Mode Leg Mode Leg – Defrost Mode* Defrost Mode* NOTE When the Leg- defrosts or defrost mode is selected, the HVAC control unit will select the recommended settings for best performance of the selected function. These settings can be overridden by manual intervention. (For details, refer HVAC layout and working). A. BLOWER SPEED CONTROL The Fan speed selector allows the user to select four blower speeds – LO, M1, M2 and HI. An OFF position is also provided to shut the system off. B. TEMPERATURE SELECTION The temperature selector knob can be used to select the required temperature varying from full cold (on the extreme anti-clockwise) and full hot (on the extreme clockwise). C. FRESH / RECIRCULATION AIR This push button can be used to position the Air inlet door, either to allow fresh air to come inside the cabin or to recirculate the air within the cabin. D. AC ON / OFF The air-conditioning ON / OFF switch is located on the control panel. Press the switch to decrease the air temperature inside the cabin. The indicator lamp on the switch glows when the switch is in “ON” position. The blower motor must be running for the indicator lamp to glow. When it is pressed once AC ON (Amber LED glows) is selected and if pressed again AC switches OFF. This is also helpful to defrost / defog the windshield in case of high air humidity.
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