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Heating/Air Conditioning Service

AUT 214W

Heating/Air Conditioning Service

AUT 214W

Course Description

Prerequisite: AUT 100 and AUT 108 with a minimum grade of "C" (2.0). Studies passenger car and light truck heating and air conditioning terminology, operation and diagnosis. Develops skills in diagnosis and repair of the heating and air conditioning system components. (50-50)

Outcomes and Objectives

Diagnose and repair A/C System. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.

Objectives:

  • Identify and interpret heating and air conditioning concern; determine necessary action. P-1
  • 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
  • Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, calibration decals). P-1
  • Performance test A/C system; diagnose A/C system malfunctions using principles of refrigeration. P-1
  • Diagnose abnormal operating noises in the A/C system; determine necessary action. P-2
  • Identify refrigerant type; conduct a performance test of the A/C system; determine necessary action. P-1
  • Leak test A/C system; determine necessary action. P-1
  • Inspect the condition of discharged oil; determine necessary action. P-2
  • Determine recommended oil for system application. P-1

Diagnose and repair refrigeration system compressor and clutch. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.

Objectives:

  • Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and PCM) to interrupt system operation; determine necessary action. P-2
  • Inspect A/C compressor drive belts; determine necessary action. P-2
  • Inspect, test, and/or replace A/C compressor clutch components and/or assembly. P-2
  • Remove and reinstall A/C compressor and mountings; measure oil quantity; determine necessary action. P-1

Diagnose and repair refrigeration system evaporator, condenser, and related components. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.

Objectives:

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

Diagnose and repair heating, ventilation, and engine cooling systems. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.

Objectives:

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

Diagnose and repair operating systems and related controls. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.

Objectives:

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

Recover, recycle, and handle refrigerant. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.

Objectives:

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