AUT 709 - Auto Heating & AC

1. Perform proper shop safety procedures.
   1. Apply work area safety skills.
   2. Demonstrate safe personal working habits.
   3. Practice safe tool and equipment usage.
   4. Follow manufacturer’s repair procedures.
   5. Follow manufacturer and government warnings and regulations.
2. Demonstrate knowledge of refrigeration principles.
   1. Explain laws governing heat and temperature.
   2. Discuss the history of air conditioning.
   3. Identify the refrigeration circuit.
3. Demonstrate an understanding of laws concerning CFCs and HFCs.
   1. Describe the effects of the Montreal Protocol.
   2. Explain the Federal Clean Air Act.
   3. Compare various refrigerants by automotive manufacturers.
   4. Complete a test for CFC recovery.
   5. Understand the SAE standards that apply to air conditioning.
   6. Operate refrigerant recovery and recycling equipment according to Federal laws.
4. Diagnosis & Repair HVAC System
   1. Research vehicle service information, including refrigerant/oil/fluid type, vehicle service history, service precautions, technical service bulletins, and recalls including vehicles equipped with advanced driver assistance systems (ADAS).
   2. Identify heating, ventilation, and air conditioning (HVAC) components and configurations.
   3. Retrieve and record DTCs, OBD monitor status, and freeze frame data; clear codes and data when directed.
   4. Perform A/C system performance test; interpret results; determine needed action.
   5. Identify abnormal operating noises in the A/C system; determine needed action.
   6. Leak test A/C system; determine needed action.
   7. Identify and interpret heating and air conditioning problems; determine needed action.
   8. Identify refrigerant type; test for sealant; select and connect proper gauge set/test equipment; record temperature and pressure readings.
   9. Inspect condition/quantity of refrigerant oil removed from A/C system; determine needed action.
   10. Determine recommended oil and oil capacity for system application and component(s) replacement.
5. Diagnosis & Repair HVAC Refrigeration System Components
   1. Inspect, remove, and/or replace A/C compressor drive belts, pulleys, tensioners; determine needed action.
   2. Inspect for proper A/C condenser airflow; determine needed action.
   3. Inspect evaporator housing condensation drain; determine needed action.
   4. Inspect, test, and/or service A/C compressor clutch components and/or assembly; determine needed action.
   5. Remove, inspect, reinstall, and/or replace A/C compressor and mountings; determine recommended oil type and quantity.
   6. Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves; determine needed action.
   7. Remove, inspect, and replace receiver/drier or accumulator/drier; determine recommended oil type and quantity.
   8. Remove, inspect, and install expansion valve or orifice (expansion) tube.
   9. Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and/or control module) to interrupt system operation; determine needed action.
   10. Determine procedure to remove and reinstall evaporator; determine required oil type and quantity.
   11. Remove, inspect, reinstall, and/or replace condenser; determine required oil type and quantity.
6. Diagnosis and Repair HVAC & Engine Cooling Systems
   1. Inspect engine cooling and heater systems hoses and pipes; determine needed action.
   2. Inspect and test heater control valve(s); determine needed action
   3. Diagnose temperature control problems in the HVAC system related to the engine cooling system, including electric heating; determine needed action.
   4. Determine procedure to remove, inspect, reinstall, and/or replace heater core; properly refill system.
7. Diagnosis and Repair HVAC Operating Systems and Related Controls
   1. Inspect HVAC system ducts, doors, hoses, cabin filters, and outlets; determine needed action.
   2. Identify the source of HVAC system odors.
   3. Inspect and test HVAC system blower motors, resistors, switches, relays, wiring, and protection devices; determine needed action.
   4. Diagnose A/C compressor control systems; determine needed action.
   5. Diagnose malfunctions in the vacuum, mechanical, and/or electrical components and controls of the HVAC system; determine needed action.
   6. Inspect, test, remove and/or replace HVAC system control panel; determine needed action.
   7. Check operation of automatic HVAC control systems; determine needed action.
8. Apply HVAC Refrigerant Recovery, recycling, and Handling Equipment
   1. Demonstrate awareness of the need to recover, recycle, and handle refrigerants using proper equipment and procedures
   2. Use and maintain refrigerant handling equipment according to equipment manufacturer’s standards.
   3. Identify A/C system refrigerant; test for sealants; recover, evacuate, and charge A/C system; add refrigerant oil as required.
   4. Recycle, label, and store refrigerant.