Please enable JavaScript to view this page.

Heating and Air Conditioning Level 2

AUTO 157

Heating and Air Conditioning Level 2

AUTO 157

Course Description

Prerequisites: Prerequisites: AUTO 107 and AUTO 149.

Practices the service of vehicle HVAC systems. Practices NATEF tasks to AST (Automotive Service Technology) level related to HVAC systems. (15-15)

Outcomes and Objectives

Complete general A/C System diagnosis and Repair Level 2 NATEF tasks as listed below.

Objectives:

  • Identify and interpret heating and air conditioning problems; determine necessary action.
  • Research applicable vehicle and service information, vehicle service history, service precautions, and technical service bulletins.
  • Performance test A/C system; identify problems.
  • Identify abnormal operating noises in the A/C system; determine necessary action.
  • Identify refrigerant type; select and connect proper gauge set; record temperature and pressure readings.
  • Leak test A/C system; determine necessary action
  • Inspect condition of refrigerant oil removed from A/C system; determine necessary action.
  • Determine recommended oil and oil capacity for system application.
  • Using a scan tool, observe and record related HVAC data and trouble codes.

Complete Level 2 NATEF tasks related to Refrigeration System Components as listed below.

Objectives:

  • Inspect and replace A/C compressor drive belts, pulleys, and tensioners; determine necessary action.
  • Inspect, test, service or replace A/C compressor clutch components and/or assembly; check compressor clutch air gap; adjust as needed.
  • Remove, inspect, and reinstall A/C compressor and mountings; determine recommended oil quantity.
  • Identify hybrid vehicle A/C system electrical circuits and the service/safety precautions.
  • Determine need for an additional A/C system filter; perform necessary action.
  • Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves; perform necessary action.
  • Inspect A/C condenser for airflow restrictions; determine necessary action.
  • Remove, inspect, and reinstall receiver/drier or accumulator/drier; determine recommended oil quantity.
  • Remove, inspect, and install expansion valve or orifice (expansion) tube.
  • Inspect evaporator housing water drain; perform necessary action.

Complete Level 2 NATEF tasks related to Heating, Ventilation, and Engine Cooling Systems Diagnosis and Repair as listed below.

Objectives:

  • Inspect engine cooling and heater systems hoses; perform necessary action.
  • Inspect and test heater control valve(s); perform necessary action.

Complete Level 2 NATEF tasks related to Operating Systems and Related Controls Diagnosis and Repair as listed below.

Objectives:

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

Complete Level 2 NATEF tasks related to Refrigerant Recovery, Recycling, and Handling as listed below.

Objectives:

  • Perform correct use and maintenance of refrigerant handling equipment according to equipment manufacturer’s standards.
  • Identify and recover A/C system refrigerant.
  • Recycle, label, and store refrigerant.
  • Evacuate and charge A/C system; add refrigerant oil as required.