AUT 703 - Automotive Heating and Air Conditioning
Last Date of Approval: 4-2021
3 Credits
Total Lecture Hours: 22.5
Total Lab Hours: 45
Total Clinical Hours: 0
Total Work-Based Experience Hours: 0
Course Description:
This course will place emphasis on the principles of heating and air conditioning including theory of operation, maintenance, diagnosis, repair, and Freon recovery. Students will receive instruction on servicing heating and air conditioning systems including system charging, operational testing, troubleshooting, repair, and environmental concerns. This course will help students refine their critical thinking skills as they evaluate various topics and concepts while searching for underlying connections between the concepts, which is a skill that should be beneficial in any/all types of careers. The students will increase their mechanical aptitude that can be used in many aspects of their life.
Prerequisites/Corequisites: A student is to have completed all prior program courses with a “C” or better grade. Any exception will have to be approved in writing by the Program Coordinator and Department Chair. Because of changes in technology, students taking program over an extended period of time may be advised to retake courses to update skills and competencies.
Mode(s) of Instruction: Traditional/face-to-face
Credit for Prior Learning: There are no Credit for Prior Learning opportunities for this course.
Course Fees: Course Materials: $20.00
Common Course Assessment(s): None
Student Learning Outcomes and Objectives:
Student Learning Outcomes:
1.Students will demonstrate the ability to diagnose and repair heating and air conditioning concerns within the following categories according to NATEF.
A. A/C system diagnosis and repair
B. Refrigeration system component diagnosis and repair
C. Heating, ventilation, and engine cooling systems diagnosis and repair
D. Operating systems and related controls diagnosis and repair
E. Refrigerant recovery, recycling, and handling
F. Lubrication and cooling systems diagnosis and repair
Course Objectives:
1. Complete work order to include customer information, vehicle identifying information, customer concern, related service history, cause, and correction. 2. Identify and interpret heating and air conditioning concern; determine necessary action.
3. Research applicable vehicle and service information, such as heating and air conditioning system operation, vehicle service history, service precautions, and technical service bulletins.
4. Locate and interpret vehicle and major component identification numbers. 5. Performance test A/C system; identify A/C system malfunctions.
6. Identify abnormal operating noises in the A/C system; determine necessary action.
7. Identify refrigerant type; select and connect proper gauge set; record temperature and pressure readings.
8. Leak test A/C system; determine necessary action.
9. Inspect the condition of refrigerant oil removed from the system; determine necessary action.
10. Determine recommended oil and oil capacity for system application.
11. Using scan tool, observe and record related HVAC data and trouble codes.
12. Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and PCM) to interrupt system operation; determine necessary action.
13.Inspect and replace A/C compressor drive belts, pulleys, and tensioners; determine necessary action.
14. Inspect, test, and/or replace A/C compressor clutch components and/or assembly; check compressor clutch air gap and adjust as needed.
15. Remove, inspect, and reinstall A/C compressor and mountings; determine required oil quantity.
16. Identify hybrid vehicle A/C system electrical circuits, service and safety precautions.
17. Determine the need for an additional A/C system filter; perform necessary action.
18. Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves; perform necessary action.
19. Inspect A/C condenser for airflow restrictions; perform necessary action. 20. Remove, inspect, and reinstall receiver/drier or accumulator/drier; determine required oil quantity.
21. Remove, inspect, and install expansion valve or orifice (expansion) tube. 22. Inspect evaporator housing water drain; perform necessary action.
23. Remove, inspect, and reinstall evaporator; determine required oil quantity.
24. Remove, inspect, and reinstall condenser; determine required oil quantity.
25. Diagnose temperature control problems in the heater/ventilation system; determine necessary action.
26. Perform cooling system pressure tests; check coolant condition, inspect and test radiator, cap (pressure/vacuum), coolant recovery tank, and hoses; perform necessary action.
27. Inspect engine cooling and heater system hoses and belts; perform necessary action.
28. Inspect, test, and replace thermostat and gasket/seal.
29. Determine coolant condition and coolant type for vehicle application; drain and recover coolant.
30. Flush system; refill system with recommended coolant; bleed system.
31. Inspect and test cooling fan, fan clutch, fan shroud, and air dams; perform necessary action.
32. Inspect and test electric cooling fan, fan control system and circuits; determine necessary action.
33. Inspect and test heater control valve(s); perform necessary action.
34. Remove, inspect, and reinstall heater core.
35. Diagnose malfunctions in the electrical controls of heating, ventilation, and A/C (HVAC) systems; determine necessary action.
36. Inspect and test A/C-heater blower, motors, resistors, switches, relays, wiring, and protection devices; perform necessary action.
37. Test and diagnose A/C compressor clutch control systems; determine necessary action.
38. Diagnose malfunctions in the vacuum, mechanical, and electrical components and controls of the heating, ventilation, and A/C (HVAC) system; determine necessary action.
39. Inspect and test A/C-heater control panel assembly; determine necessary action.
40. Inspect and test A/C-heater control cables, motors, and linkages; perform necessary action.
41. Inspect A/C-heater ducts, doors, hoses, cabin filters and outlets; perform necessary action.
42. Identify the source of A/C system odors.
43. Check operation of automatic or semi-automatic heating, ventilation, and airconditioning (HVAC) control systems; determine necessary action.
44. Perform correct use and maintenance of refrigerant handling equipment according to equipment manufacturer’s standards.
45. Identify and recover A/C system refrigerant.
46. Recycle, label, and store refrigerant. Evacuate and charge A/C system; add refrigerant oil as required.
47. Perform cooling system pressure tests; check coolant condition; inspect and test radiator, pressure cap, coolant recovery tank, and hoses; determine necessary action.
48. Inspect and replace engine cooling and heater system hoses.
49. Inspect, test, and replace thermostat and gasket/seal.
50. Test coolant; drain and recover coolant; flush and refill cooling system with recommended coolant; bleed air as required.
51. Remove and replace radiator.
52. Inspect, and test fans(s) (electrical or mechanical), fan clutch, fan shroud, and air dams.
53. Inspect auxiliary coolers; determine necessary action.
54. Identify causes of engine overheating.
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