AUT 214W - Heating/Air Conditioning ServiceCredits: 5 Instructional Contact Hours: 7
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.
Prerequisite(s): AUT 100 and AUT 108 each with a minimum grade of “C” (2.0) Corequisite(s): AUT 210W , AUT 212W Lecture Hours: 50 Lab Hours: 50 Meets MTA Requirement: None Pass/NoCredit: No
Outcomes and Objectives 1. 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.
A. Identify and interpret heating and air conditioning concern; determine necessary action. P-1
B. 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
C. Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, calibration decals). P-1
D. Performance test A/C system; diagnose A/C system malfunctions using principles of refrigeration. P-1
E. Diagnose abnormal operating noises in the A/C system; determine necessary action. P-2
F. Identify refrigerant type; conduct a performance test of the A/C system; determine necessary action. P-1
G. Leak test A/C system; determine necessary action. P-1
H. Inspect the condition of discharged oil; determine necessary action. P-2
I. Determine recommended oil for system application. P-1
2. 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.
A. Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and PCM) to interrupt system operation; determine
necessary action. P-2
B. Inspect A/C compressor drive belts; determine necessary action. P-2
C. Inspect, test, and/or replace A/C compressor clutch components and/or assembly. P-2
D. Remove and reinstall A/C compressor and mountings; measure oil quantity; determine necessary action. P-1
3. 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.
A. Determine need for an additional A/C system filter; perform necessary action. P-3
B. Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves; perform necessary action. P-2
C. Inspect A/C condenser for airflow restrictions; perform necessary action. P-1
D. Remove and reinstall receiver/drier or accumulator/drier; measure oil quantity; determine necessary action. P-1
E. Remove and install expansion valve or orifice (expansion) tube. P-2
F. Inspect evaporator housing water drain; perform necessary action. P-3
G. Remove and reinstall evaporator; measure oil quantity; determine necessary action. P-3
H. Remove and reinstall condenser; measure oil quantity; determine necessary action. P-3
4. 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.
A. Diagnose temperature control problems in the heater/ventilation system; determine necessary action. P-2
B. Perform cooling system, cap, and recovery system tests (pressure, combustion leakage, and temperature); determine necessary action.
P-1
C. Inspect engine cooling and heater system hoses and belts; perform necessary action. P-1
D. Inspect, test, and replace thermostat and housing. P-1
E. Determine coolant condition and coolant type for vehicle application; drain and recover coolant. P-1
F. Flush system; refill system with recommended coolant; bleed system. P-1
G. Inspect and test cooling fan, fan clutch, fan shroud, and air dams; perform necessary action. P-1
H. Inspect and test electric cooling fan, fan control system and circuits; determine necessary action P-2
I. Inspect and test heater control valve(s); perform necessary action. P-2
J. Remove and reinstall heater core. P-3
5. 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.
A. Diagnose malfunctions in the electrical controls of heating, ventilation, and A/C (HVAC) systems; determine necessary action. P-2
B. Inspect and test A/C-heater blower, motors, resistors, switches, relays, wiring, and protection devices; perform necessary action. P-1
C. Test and diagnose A/C compressor clutch control systems; determine necessary action. P-1
D. Diagnose malfunctions in the vacuum and mechanical components and controls of the heating, ventilation, and A/C (HVAC) system;
determine necessary action. P-2
E. Inspect and test A/C-heater control panel assembly; determine necessary action. P-3
F. Inspect and test A/C-heater control cables and linkages; perform necessary action. P-3
G. Inspect A/C-heater ducts, doors, hoses, cabin filters and outlets; perform necessary action. P-3
H. Check operation of automatic and semi-automatic heating, ventilation, and air-conditioning (HVAC) control systems; determine necessary
action. P-3
6. Recover, recycle, and handle refrigerant. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed
below.
A. Perform correct use and maintenance of refrigerant handling equipment. P-1
B. Identify (by label application or use of a refrigerant identifier) and recover A/C system
refrigerant. P-1
C. Recycle refrigerant. P-1
D. Label and store refrigerant. P-1
E. Test recycled refrigerant for non-condensable gases. P-1
F. Evacuate and charge A/C system. P-1
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