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.
1972 Chevrolet Chevelle Concours, Not Available, 6.6L Eng VIN RFACTORY OEM SERVICE PROCEDURE
Cruise Control Systems
- Description
- Operation
- Preliminary Checks
- Trouble Shooting & Diagnosis
- Will Not Engage - System Inoperative
- Does Not Cruise At Engagement Speed
- System Hunts, Pulses Or Surges
- System Does Not Disengage With Brake Pedal
- System Accelerates Or Applies Full Throttle When Engaged
- Cannot Adjust Speed Downward With Engage Button
- System Can Be Engaged At Idle By Depressing Switch, But Drops Out When Switch Is Released
- System Operates Correctly, But Vacuum Bleeds Off When System Disengaged
- Does Not Engage Or Engages At Speeds Lower Than 30 Mph
- Servo & Vacuum Check Out
- Vacuum Brake Switch
- Adjustments
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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