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. Identify and interpret heating and air conditioning concern; determine necessary
action. P-1
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
3. Locate and interpret vehicle and major component identification numbers (VIN,
vehicle certification labels, calibration decals). P-1
4. Performance test A/C system; diagnose A/C system malfunctions using principles
of refrigeration. P-1
5. Diagnose abnormal operating noises in the A/C system; determine necessary
action. P-2
6. Identify refrigerant type; conduct a performance test of the A/C system;
determine necessary action. P-1
7. Leak test A/C system; determine necessary action. P-1
8. Inspect the condition of discharged oil; determine necessary action. P-2
9. Determine recommended oil for system application. 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 A/C compressor drive belts; determine necessary action. P-2
3. Inspect, test, and/or replace A/C compressor clutch components and/or assembly.
P-2
4. Remove and reinstall A/C compressor and mountings; measure oil quantity;
determine necessary action. P-1
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 and reinstall receiver/drier or accumulator/drier; measure oil quantity;
determine necessary action. 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 and reinstall evaporator; measure oil quantity; determine necessary
action. P-3
8. Remove and reinstall condenser; measure oil quantity; determine necessary
action. 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, cap, and recovery system tests (pressure, combustion
leakage, and temperature); determine 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 housing. 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 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 and mechanical 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 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
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