Remove, inspect, and reinstall A/C compressor and mountings; determine recommended oil quantity
Lesson Plan for
AUT 184-185/AUT 292 Special Problems
Automotive Service Technology Section C/Automotive Special Problems
Course HS Title: / Automobile Service Technology/Special Problems / Program:KCTCS Courses included in HS Title: (Lesson is prepared for course highlighted.)
KCTCS Course No. / KCTCS Course Title
Introduction/Context / This lesson will instruct the student on how to remove, inspect, and reinstall A/C compressor and mountings, and determine recommended oil quantity. Knowledge of these techniques and the skills required to correct problems associated with this task are necessary for a student to acquire if they wish to compete for high paying, high skilled jobs in an Automotive Repair Facility. Entry level technicians need to be able to perform this task to 100% accuracy. Incorrectly performing this task can lead to an automobile accident or create customer satisfaction issues.
Prepared By / School / Date:
Grade Level / No. Students / No.IEP's: / Lesson Length:
Task
Remove, inspect, and reinstall A/C compressor and mountings; determine recommended oil quantity.
No. / Objective
1 / Given the proper tools and instruction, the student will be able to remove, inspect, and reinstall A/C compressor and mountings, determine recommended oil quantity, and pass a written test covering the task with 100% accuracy.
Connections:
Skills Standards:OH 001
OH 002
OH 003
OD 002
OD 003
OD 005
Common Core Technical Standards:
TD-SYS-2
New Common Core Standards:
RST 11-12.2
RST 11-12 3
INSTRUCTIONAL MATERIALS/TECHNOLOGY
Teacher Designed Materials and Other Handouts
Textbooks and Workbooks
Motor Information Systems / ASE Test Preparation Guide / 2009 / Prentice Hall/Pearson / 460
Chris Johanson / Auto Heating and Air Conditioning Shop Manual / 2004 / Goodheart Wilcox / 106
Web Addresses
Today's Class / Melior / www.todaysclass.com
Equipment
As Needed / Recovery Recycling Machine / Various
Content/Presentation/Demonstration Outline
Let them know that although exact procedures vary by model, most can be removed using the following: * Tell students to disconnect electrical wiring at the compressor. * Then discharge the system using a recovery and recycling station. Be sure to recycle the refrigerant and measure the oil lost from the system. * Remove accessory drive belts as needed. * Inform students to separate the hose fittings from the compressor and immediately seal or cap all openings to prevent moisture and dirt from entering the system. * Inform students to remove the fasteners holding the compressor to its mounting brackets, and lift the compressor and clutch assembly from the vehicle as a unit.
Explain that flushing may be recommended to assure there would not be any contaminants remaining in the A/C system from a failed compressor, plugged orifice tube, receiver-drier, or accumulator. Let students know that at the time of doing an R-12 to R-134a retrofit some manufacturers suggest flushing the system also.
When installing the original compressor or a replacement compressor, tell students to make sure the new unit contains the correct amount of the recommended oil, tighten all fasteners to specified torque, and fit a new drive belt and adjust it to the correct tension. Inform them that if contamination or moisture damage is found in the old compressor, install anew receiver-drier as well.
Make students aware that receiver-drier or accumulator replacement may be required for warranty by the compressor re-builder. After all the above is done, tell students to evacuate and charge the system with the correct amount of the proper refrigerant and operate the system to check performance.
IMPORTANT: Instruct students that to prevent compressor failure, the correct amount of oil must be added to the compressor. Let them know that amounts vary widely, anywhere from 5 ounces to 11 ounces. Explain that many new and remanufactured compressors come filled with oil. It is a good practice to drain and measure the new oil, and add more if necessary. Be sure the students know to use the proper type of oil, and to add oil according to instructions.
Applications/Practice
Evaluation and feedback Prior to Testing or Lab Work
STUDENT ASSESSMENT:(Assess student progress with performance criteria.)
IMPACT--Reflection/Analysis of Teaching and Learning: (How did students’ progress in relation to the state objectives? Was the instruction successful? Analyze samples of student work particularly that which is unsatisfactory, for the purpose of planning further instruction.)
REFINEMENT--Lesson Extension and Follow-up: (To be filled in as the lesson is modified during initial planning and/or during the teaching learning process.)