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Oct 12, 2024
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AUTO 157 - Heating and Air Conditioning Level 2Credits: 1 Practices the service of vehicle HVAC systems. Practices NATEF tasks to AST (Automotive Service Technology) level related to HVAC systems.
Prerequisite(s): AUTO 107 and AUTO 149 . Corequisite(s): None Lecture Hours: 15 Lab Hours: 15 Meets MTA Requirement: None Pass/NoCredit: No
Outcomes and Objectives
- Complete general A/C System diagnosis and Repair Level 2 NATEF tasks as listed below.
- 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.
- 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.
- 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.
- 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.
- 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.
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