ATG 326 - GM Auto AC Systems Credits: 3 Lecture Hours: 2 Lab Hours: 2 Practicum Hours: 0 Work Experience: 0 Course Type: Voc/Tech Theory of operation of General Motors air conditioning systems leading to the diagnosis, service and repair of current models of GM vehicles. Prerequisite: Admission to Automotive Service Educational Program (ASEP), ATG 312 and AUT 114 Competencies
- Demonstrate safe work habits.
- Use proper eye protection.
- Select proper tools to work in a safe manner.
- Demonstrate a concern for the safety of fellow workers.
- Demonstrate knowledge of refrigeration principles.
- Explain laws governing heat and temperature.
- Discuss the history of air conditioning.
- Identify the refrigeration circuit.
- Demonstrate an understanding of laws concerning CFCs and HFCs.
- Describe the effects of the Montral Protocol.
- Explain the Federal Clean Air Act.
- Compare various refrigerants used by automotive manufacturers.
- Complete a test for CFC recovery.
- Understand the SAE standards that apply to air conditioning.
- Operate refrigerant recovery and recycling equipment according to Federal laws.
- Air Conditioning System Diagnosis and Repair.
- Identify and interpret heating and air conditioning problems; determine necessary action.
- Research applicable vehicle and service information, vehicle service history, service precautions, and technical service bulletins.
- Performance test A/C system; determine necessary action.
- Identify abnormal operating noises in the A/C system; determine necessary action.
- Identify refrigerant type; select and connect proper gauge set; record temperature and pressure readings.
- Leak test A/C system; determine necessary action.
- Inspect condition of refrigerant oil removed from A/C system; determine necessary action.
- Determine recommended oil and oil capacity for system application.
- Using a scan tool, observe and record related HVAC data and trouble codes.
- Refrigerant System Component Diagnosis and Repair.
- Inspect and replace A/C compressor drive belts, pulleys, and tensioners; determine necessary action.
- Inspect, test, service or replace A/C compressor clutch components and/or assembly; check compressor clutch air gap; adjust as needed.
- Remove, inspect, and reinstall A/C compressor and mountings; determine recommended oil quantity.
- Identify hybrid vehicle A/C system electrical circuits and service/safety precautions.
- Determine need for an additional A/C system filter; perform necessary action.
- Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves; perform necessary action.
- Inspect A/C condenser for airflow restrictions; perform necessary action.
- Remove, inspect, and reinstall receiver/drier or accumulator/drier; determine recommended oil quantity.
- Remove, inspect, and install expansion valve or orifice (expansion) tube.
- Inspect evaporator housing water drain; perform necessary action.
- Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and PCM) to interrupt system operation; determine necessary action.
- Determine procedure to Remove and reinstall evaporator; determine required oil quantity.
- Remove, inspect, and reinstall condenser; determine required oil quantity.
- Heating, Ventilation, and Engine Cooling Systems Diagnosis and Repair.
- Inspect engine cooling and heater systems hoses; perform necessary action.
- Inspect and test heater control valve(s); perform necessary action.
- Diagnose temperature control problems in the heater/ventilation system; determine PCM) to interrupt system operation; determine necessary action.
- Determine procedure to remove, inspect, and reinstall heater core.
- Check operation of electrical and mechanical cooling fans.
- Operating Systems and Related Controls Diagnosis and Repair.
- Inspect and test A/C-heater blower motors, resistors, switches, relays, wiring, and protection devices; perform necessary action
- Diagnose A/C compressor clutch control systems; determine necessary action.
- Diagnose malfunctions in the vacuum, mechanical, and electrical components and controls of the heating, ventilation, and A/C (HVAC) system; determine necessary action.
- Inspect and test A/C-heater control panel assembly; determine necessary action.
- Inspect and test A/C-heater control cables, motors, and linkages; perform necessary action.
- Inspect A/C-heater ducts, doors, hoses, cabin filters, and outlets; perform necessary action.
- Identify the source of A/C system odors.
- Check operation of automatic or semi-automatic heating, ventilation, and air-conditioning (HVAC) control systems; determine necessary action.
- Refrigerant Recovery, Recycling, and Handling.
- Perform correct use and maintenance of refrigerant handling equipment according to equipment manufacturer’s standards
- Identify and recover A/C system refrigerant.
- Recycle, label and store refrigerant.
- Evacuate and charge A/C system; add refrigerant oil as required.
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