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2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
compressor which can maintain A/C demand under all conditions without cycling on and off.
Combined with Variable Displacement Orifice Tube (VDOT) system, HVAC control head
regulates blower motor fan speed and generates command signals to A/C-heater programmer and
blower control module. The VDOT system for automatic, dual-zone A/C-heater system is similar
to manual A/C-heater system.
OPERATION
HVAC CONTROL HEAD
The Heating Ventilation Air Conditioning (HVAC) control head (panel) controls operation of
A/C-heater system. A/C-heater system is a dual-zone system and can adjust temperature for driver
and for passenger comfort. When in AUTO mode, system can automatically adjust A/C-heater
controls. HVAC control head is monitored by Body Control Module (BCM) and has self-
diagnostic capabilities.
A/C Button
Manually activates and deactivates A/C compressor. A/C can be selected in all modes except
FRONT defrost mode. If A/C is selected during FRONT defrost mode, A/C button light will
flash, indicating this function is not available at this time. See Fig. 1 .
AUTO Mode Button
In this mode, system automatically adjusts mode, blower motor fan speed, and A/C compressor to
maintain temperature selected by driver. Blower motor speed is controlled automatically unless it
is changed by pressing fan up or down button. See Fig. 1 .
Bi-Level Mode
In this mode, airflow from HVAC module is directed to flow through heater and A/C outlets,
with a small amount directed to defroster and side window defroster outlets.
Blower Speed Select Switch
Manually controls blower speed. When selected, AUTO mode is turned off and manual control of
HVAC system is available.
Defog Mode
When defogger mode is selected, outside air is dehumidified, then heated. Airflow is directed to
flow through defroster and floor outlets.
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