Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1972CHEVELLE BASE, NOT AVAILABLE, 6.6L ENG VIN U, NOT AVAILABLE TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAUTOMATIC TEMPERATURE CONTROL TESTINGTESTINGNOTES
1972 Chevrolet Chevelle Base, Not Available, 6.6L Eng VIN U, Not Available Trans
Automatic Temperature Control Testing: Testing: Notes
1972 Chevrolet Chevelle Base, Not Available, 6.6L Eng VIN U, Not Available TransSECTION Notes
NOTE:
Testing and Servicing data below applies to all General Motors 1971 and 1972 Automatic Temperature Control, Automatic Climate Control and Comfortron systems except Pontiac Grand Prix system.
PONTIAC GRAND PRIX NOTE: This model has a different system with an electrical motor type programmer. Testing and servicing data for this type control is given in the "Pontiac Grand Prix Automatic Temperature Control" data .
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.