AMT 43 Tasks

Heating and Air Conditioning

For every task in Heating and Air Conditioning, the following safety requirement must be strictly enforced:

Comply with personal and environmental safety practices associated with clothing; eye protection; hand tools; power equipment; proper ventilation; and the handling, storage, and disposal of chemicals/materials in accordance with local, state, and federal safety and environmental regulations.

VII. Heating and Air Conditioning

A. A/C System Diagnosis and Repair

1. Complete work order to include customer information, vehicle identifying information, customer concern, related service history, cause, and correction. P-1
2. Identify and interpret heating and air conditioning concern; determine necessary action. P-1
3. Research applicable vehicle and service information, such as heating and air conditioning system operation, vehicle service history, service precautions, and technical service bulletins. P-1
4. Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, calibration decals). P-1
5. Performance test A/C system; diagnose A/C system malfunctions using principles of refrigeration. P-1
6. Diagnose abnormal operating noises in the A/C system; determine necessary action. P-2
7. Identify refrigerant type; select and connect proper gauge set; record readings. P-1
8. Leak test A/C system; determine necessary action. P-1
9. Inspect the condition of discharged oil; determine necessary action. P-2
10. Determine recommended oil for system application. P-1
11. Using scan tool, observe and record related HVAC data and trouble codes. P-1

VII. Heating and Air Conditioning

B. Refrigeration System Component Diagnosis and Repair

1. Compressor and Clutch

1. Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and PCM) to interrupt system operation; determine necessary action. P-2
2. Inspect and replace A/C compressor drive belts; determine necessary action. P-1
3. Inspect, test, and/or replace A/C compressor clutch components and/or assembly. P-2
4. Remove, inspect, and reinstall A/C compressor and mountings; determent required oil quantity. P-1
5. Identify hybrid vehicle AC system electrical circuits, service and safety precautions. P-3

2. Evaporator, Condenser, and Related Components

1. Determine need for an additional A/C system filter; perform necessary action. P-3
2. Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves; perform necessary action. P-2
3. Inspect A/C condenser for airflow restrictions; perform necessary action. P-1
4. Remove, inspect and reinstall receiver/drier or accumulator/drier; determine required oil quantity. P-1
5. Remove and install expansion valve or orifice (expansion) tube. P-2
6. Inspect evaporator housing water drain; perform necessary action. P-3
7. Remove, inspect, and reinstall evaporator; determine required oil quantity. P-3
8. Remove, inspect, and reinstall condenser; determine required oil quantity. P-3

VII. Heating and Air Conditioning

C. Heating, Ventilation, and Engine Cooling Systems Diagnosis and Repair

1. Diagnose temperature control problems in the heater/ventilation system; determine necessary action. P-2
2. Perform cooling system pressure tests; check coolant condition, inspect and test radiator, pressure cap, coolant recovery tank and hoses; perform necessary action. P-1
3. Inspect engine cooling and heater system hoses and belts; perform necessary action. P-1
4. Inspect, test, and replace thermostat and gasket. P-1
5. Determine coolant condition and coolant type for vehicle application; drain and recover coolant. P-1
6. Flush system; refill system with recommended coolant; bleed system. P-1
7. Inspect and test cooling fan, fan clutch, fan shroud, and air dams; perform necessary action. P-1
8. Inspect and test electric cooling fan, fan control system and circuits; determine necessary action. P-1
9. Inspect and test heater control valve(s); perform necessary action. P-2
10. Remove, inspect, and reinstall heater core. P-3

VII. Heating and Air Conditioning

D. Operating Systems and Related Controls Diagnosis and Repair

1. Diagnose malfunctions in the electrical controls of heating, ventilation, and A/C (HVAC) systems; determine necessary action. P-2
2. Inspect and test A/C-heater blower, motors, resistors, switches, relays, wiring, and protection devices; perform necessary action. P-1
3. Test and diagnose A/C compressor clutch control systems; determine necessary action. P-1
4. Diagnose malfunctions in the vacuum, mechanical, and electrical components and controls of the heating, ventilation, and A/C (HVAC) system; determine necessary action. P-2
5. Inspect and test A/C-heater control panel assembly; determine necessary action. P-3
6. Inspect and test A/C-heater control cables, motors, and linkages; perform necessary action. P-3
7. Inspect A/C-heater ducts, doors, hoses, cabin filters and outlets; perform necessary action. P-3
8. Check operation of automatic and semi-automatic heating, ventilation, and air-conditioning (HVAC) control systems; determine necessary action. P-3

VII. Heating and Air Conditioning

E. Refrigerant Recovery, Recycling, and Handling

1. Perform correct use and maintenance of refrigerant handling equipment. P-1
2. Identify (by label application or use of a refrigerant identifier) and recover A/C system refrigerant. P-1
3. Recycle refrigerant. P-1
4. Label and store refrigerant. P-1
5. Test recycled refrigerant for non-condensable gases. P-1
6. Evacuate and charge A/C system. P-1