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Chevrolet
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1972
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Chevelle Base, Not Available, 6.6L Eng VIN S, Not Available Trans
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Repair and Diagnosis
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Heating, Ventilation & A/C (HVAC)
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HVAC Control Systems
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Automatic Temperature Control
Automatic Temperature Control
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Description
Components & Functions
Programmer
Notes
Vacuum Motor
Vacuum Checking Relay Valve
Vacuum Valve
Tranducer
Amplifier
Feedback Potentiometer
Resistor Assembly
Blower Switch
Control Head
Thumbwheel
Selector Lever
Sensors
In-Car
Ambient
Aspirator
Ambient Switch
A/C Override Switch
Engine Thermal Switch
Auto Relay
Lo Relay
Mode Door Diaphragms
Outside Air Diaphragm
Defroster Door
Restrictors
Operation
Notes
Off
Vent
Lo
Auto
Hi
Bi-Level
Def
Functional Test
Notes
OFF - Dial @ 65
VENT - Dial @ 65
LO - Dial @ 65
AUTO - Dial @ 65
Rotate Dial To 85
HI - Dial @ 65
BI-LEVEL - Dial @ 65
DEF - Dial @ 65
Superheat Switch & Thermal Limiter
Theory Of Operation, Testing & Adjusting
Theory Of Operation
Notes
Changing An Electronic Signal to Electrical Voltage
Changing The Voltage To A Vacuum Signal
Changing The Vacuum Signal To Mechanical Energy
Testing
Adjustment
Notes
Amplifier Calibration
Programmer Temperature Door Link
Temperature Dial Calibration