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 MANUALSBUICK1982REGAL SPORT, TRANS MFR CD 350C/MX5REPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAUTO. A/C SYSTEMSTESTINGCONTROL SYSTEM TESTING
1982 Buick Regal Sport, Trans Mfr CD 350C/MX5
Control System Testing
1982 Buick Regal Sport, Trans Mfr CD 350C/MX5SECTION Control System Testing
- 65° selection drives system to maximum cold.
- 85° selection drives system to maximum heat.
- A mode L.E.D. will flash if mode is malfunctioning. (ETCC system only)
- A temperature L.E.D. will flash if temperature control actuator malfunctions. (ETCC system only)
- A disconnected mode door actuator wire will cause mode L.E.D.'s to flash. (ETCC system only)
- An inoperative mode door which is stopped in a position correct for one mode will not cause L.E.D. to flash until control panel calls for actuator to move to another position. (ETCC system only)
- Blower delay affects only heater and bi-level modes. Switch can be checked by touching 65° on control panel. Blower operation at 65° and no blower at 85° indicates a cold engine or a malfunctioning coolant temperature switch circuit. (ETCC system only)
- Blower delay affects only heater and bi-level modes. Check timer by touching 65° on control panel. No blower operation at 65° and blower when 85° is touched indicates malfunction in blower delay timer circuit. (TCC system only)
- Control must have a constant B+ first and then power from ignition switch to work properly.
- An open sensor string will drive the system to maximum heat except at 65° selection.
- A shorted sensor string circuit will drive the system to maximum cold except at 85° selection.
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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.