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.

NATEF Tasks	Description	Priority designation
A	A/C System Diagnosis and Repair
VII.A.1	Identify and interpret heating and air conditioning concern; determine necessary action.	P-1
VII.A.2	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
VII.A.3	Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, calibration decals).	P-1
VII.A.4	Performance test A/C system; diagnose A/C system malfunctions using principles of refrigeration.	P-1
VII.A.5	Diagnose abnormal operating noises in the A/C system; determine necessary action.	P-1
VII.A.6	Identify refrigerant type; conduct a performance test of the A/C system; determine necessary action.	P-1
VII.A.7	Leak test A/C system; determine necessary action.	P-1
VII.A.8	Inspect the condition of discharged oil; determine necessary action.	P-2
VII.A.9	Determine recommended oil for system application.	P-1
B	Refrigeration System Component Diagnosis and Repair
	1. Compressor and Clutch
VII.B.1.1	Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and PCM) to interrupt system operation; determine necessary action.	P-2
VII.B.1.2	Inspect A/C compressor drive belts; determine necessary action.	P-2
VII.B.1.3	Inspect, test and replace A/C compressor clutch components and/or assembly.	P-2
VII.B.1.4	Remove and reinstall A/C compressor and mountings; measure oil quantity; determine necessary action.	P-1
	2. Evaporator, Condenser, and Related Components
VII.B.2.1	Determine need for an additional A/C system filter; perform necessary action.	P-3
VII.B.2.2	Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves; perform necessary action.	P-2
VII.B.2.3	Inspect A/C condenser for airflow restrictions; perform necessary action.	P-1
VII.B.2.4	Remove and reinstall receiver/drier or accumulator/drier; measure oil quantity; determine necessary action.	P-1
VII.B.2.5	Remove and install expansion valve or orifice (expansion) tube.	P-2
VII.B.2.6	Inspect evaporator housing water drain; perform necessary action.	P-3
VII.B.2.7	Remove and reinstall evaporator; measure oil quantity; determine necessary action.	P-3
VII.B.2.8	Remove and reinstall condenser; measure oil quantity; determine necessary action.	P-3
C	Heating, Ventilation, and Engine Cooling Systems Diagnosis and Repair
VII.C.1	Diagnose temperature control problems in the heater/ventilation system; determine necessary action.	P-2
VII.C.2	Perform cooling system, cap, and recovery system tests (pressure, combustion leakage, and temperature); determine necessary action.	P-1
VII.C.3	Inspect engine cooling and heater system hoses and belts; perform necessary action.	P-1
VII.C.4	Inspect, test, and replace thermostat and housing.	P-1
VII.C.5	Determine coolant condition and coolant type for vehicle application; drain and recover coolant.	P-1
VII.C.6	Flush system; refill system with recommended coolant; bleed system.	P-1
VII.C.7	Inspect and test fan, fan clutch fan shroud, and air dams; perform necessary action.	P-1
VII.C.8	Inspect and test electric cooling fan, fan control system and circuits; determine necessary action.	P-1
VII.C.9	Inspect and test heater control valve(s); perform necessary action.	P-2
VII.C.10	Remove and reinstall heater core.	P-3
D	Operating Systems and Related Controls Diagnosis and Repair
VII.D.1	Diagnose malfunctions in the electrical controls of heating, ventilation, and A/C (HVAC) systems; determine necessary action.	P-2
VII.D.2	Inspect and test A/C-heater blower, motors, resistors, switches, relays, wiring, and protection devices; perform necessary action.	P-1
VII.D.3	Test and diagnose A/C compressor clutch control systems; determine necessary action.	P-1
VII.D.4	Diagnose malfunctions in the vacuum and mechanical components and controls of the heating, ventilation, and A/C (HVAC) system; determine necessary action.	P-2
VII.D.5	Inspect and test A/C-heater control panel assembly; determine necessary action.	P-3
VII.D.6	Inspect and test A/C-heater control cables and linkages; perform necessary action.	P-3
VII.D.7	Inspect A/C-heater ducts, doors, hoses, cabin filters and outlets; perform necessary action.	P-3
VII.D.8	Check operation of automatic and semi-automatic heating, ventilation, and air-conditioning (HVAC) control systems; determine necessary action.	P-3
E	Refrigerant Recover, Recycling, and Handling
VII.E.1	Perform correct use and maintenance of refrigerant handling equipment.	P-1
VII.E.2	Identify (by label application or use of a refrigerant identifier) and recover A/C system refrigerant.	P-1
VII.E.3	Recycle refrigerant.	P-1
VII.E.4	Label and store refrigerant.	P-1
VII.E.5	Test recycled refrigerant for non-condensable gases.	P-1
VII.E.6	Evacuate and charge A/C system.	P-1

Back to the task list