For AUTOMOTIVE HEATING AND AIR CONDITIONING - MR.CHEW
NATEFTASK SHEETSforAUTOMOTIVEHEATING ANDAIRCONDITIONING8th EditionJames D. Halderman
tor:ElizabethMacKenzie- raSmithCoverDesign:CenveoPublisherServicesFull- veticaNeueLTW1GCopyright 2018,2015,2011Pearson Education, Inc. All Rights Reserved. Manufactured in the United States of America. This publication is protected by copyright, andpermission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any formor by any means, electronic, mechanical, photocopying, recording, or otherwise. For information regarding permissions, request forms, and theappropriate contacts within the Pearson Education Global Rights and Permissions department, please visit www.pearsoned.com/permissions/.10 9 8 7 6 5 4 3 2 1ISBN-10:0-13-460385-0ISBN-13: 978-0-13-460385-8
HEATING AND AIR CONDITIONING, 8THTask Sheets Table of ContentsChapter 1 – Heating and Air-Conditioning PrinciplesAC Component Identification (None specified)1Chapter 2 – The Refrigeration CycleA/C Components Purpose and Function (None specified)2Chapter 3 – Air-Conditioning Compressors and ClutchesAir Conditioning Compressor Clutch Control Diagnosis (A7-D-2)Air Conditioning Compressor Service (A7-B-2, A7-B-3, A7-B-6)34Chapter 4 – Refrigerants and Refrigerant OilsRefrigerant Oil Inspection (A7-A-7, A7-A-8)Refrigerant Handling Equipment (A7-E-1)56Chapter 5 – A/C System Components and OperationInspect the Air Conditioning Condenser (A7-B-7)Receiver/Drier Accumulator Drier (A7-B-8)Replace Expansion Valve/Orifice Tube (A7-B-9)789Chapter 6 – Airflow Management SystemBlower Motor Diagnosis (A7-D-1)A/C and Heater Controls (A7-D-3, A7-D-4, A7-D-5)1011Chapter 7 – Engine CoolantTest and Replace Coolant (A1-D-7)12Chapter 8 – Engine Cooling System, Parts, and OperationCooling System Inspection (A7-C-1)13Chapter 9 – Heating System Operation and DiagnosisHeating System Performance Check (A7-A-1, A7-C-2)Heater System Service (A7-C-3, A7-C-4)A/C Ducts and Doors (A7-D-6)141516
Chapter 10 – HVAC Electricity and ElectronicsHVAC Electrical Controls (A7-D-1)17Chapter 11 – Automatic Temperature Control SystemsAutomatic/Dual Climate System Identification (A7-A-2)Automatic A/C System Operation Diagnosis A7-A-9, A7-D-8)1819Chapter 12 – Hybrid and Electric Vehicle HVAC SystemsHybrid Vehicle A/C System Precautions (A7-B-4)Hybrid A/C System Circuits (A7-B-4)2021Chapter 13 – Heating and Air Condition System InspectionInspect A/C Compressor Drive Belt (A7-B-1)Check A/C Condenser for Airflow Restriction (A7-B-3)Cooling and Heater Hose Inspection (A7-C-1)Inspect Cabin Filter and A/C Ducts (A7-D-1)Identify Source of A/C Odors (A7-D-2)Hybrid Vehicle A/C System Precautions (A7-B-2)222324252627Chapter 14 – Refrigerant Recovery, Recycling, and RechargingIdentify and Recover Refrigerant (A7-E-1, A7-E-2)Recycle Refrigerant (A7-E-3)Evacuate and Charge the Air Conditioning System (A7-E-4)282930Chapter 15 – A/C System Diagnosis and ServiceAir Conditioning System Performance Test (A7-A-1, A7-A-3)Air Conditioning Noise Diagnosis (A7-A-4)Refrigerant Identification/Read Pressures (A7-A-5)Leak Test the Air Conditioning System (A7-A-6)Determine Need for Refrigerant Filter (A7-B-5)Air Conditioning System Performance Check A7-B-11)Air Conditioning Control System Diagnosis (A7-D-3)Identify the Source of A/C System Odors (A7-D-7)Evaporator Housing Drain (A7-B-10)Evaporator/Heater Core Replacement (A7-B-12, A7-C-4)Condenser Replacement (A7-B-13)Inspect Belts and Hoses (A7-B-1)313233343536373839404142
1AC Component IdentificationMeets NATEF Task: (None specified)Name Date Time on TaskMake/Model/Year VIN Evaluation: 4321. Locate the air-conditioning system label. Describe the location.2. According to the label, what type of refrigerant is used in the vehicle?HFC-134a (R-134a or SUVA )CFC-12 (R-12 or Freon )3. According to the label, what is the capacity of the system?ounces4. Describe the location of the compressor5. Describe the location of the condenser6. Describe the location of the evaporator7. Describe the location of the accumulator or receiver-drier8. Does the system use an expansion valve?YesNo9. Does the system use an orifice tube?YesNo1
2A/C Component Purpose and FunctionMeets NATEF Task: None specified.Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Describe the purpose and function of the A/C compressor.2. Describe the purpose and function of the condenser.3. Describe the purpose and function of the thermal expansion valve (TXV).4. Describe the purpose and function of the orifice tube (OT).5. Describe the purpose and function of the evaporator.
3A/C Compressor Clutch Control DiagnosisMeets NATEF Task: (A7-D-2) Test and diagnose A/C compressor clutch control system;determine necessary action. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information and determine the testing and diagnostic procedures tofollow when diagnosing faults in the A/C compressor clutch control circuit (describetests).2. What test equipment is specified for use during the diagnosis? Check all that apply.a. DMMb. Scopec. Scan toold. Special tester (describe)e. Other (describe)3. After testing the A/C compressor clutch circuit, what is the necessary action?
4Air Conditioning Compressor ServiceMeets NATEF Task: (A7-B-2, A7-B-3, A7-B-6) Inspect and replace A/C compressor drivebelt(s); determine necessary cause. (P-1, P-2, P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information and list the inspection and replacement procedures for theA/C compressor drive belt clutch and replacement.2. What is the specified method to use to determine the quantity of refrigerant oil?3. Inspect lines and fittings (describe)4. Based on the inspection, what is the necessary action?
5Refrigerant Oil InspectionMeets NATEF Task: (A7-A-7, A7-A-8) Inspect condition of the refrigerant oil removed fromthe A/C system/ determine necessary action. (P-2, P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Recover the refrigerant oil during the evacuation procedure.2. How much oil was recovered?3. Visually check the condition of the oil. Describe the condition:4. What type of oil and viscosity is specified to be used?Type Viscosity 5. Based on your inspection, what is the necessary action?
6Refrigerant Handling EquipmentMeets NATEF Task: (A7-E-1) Perform correct use and maintenance of refrigerant handlingequipment. (P-1)Name Date Time on TaskMake/Model Year Evaluation: 4 3 2 11. What brand and type of refrigerant handling equipment is being used (describe)?2. Check the instructions for the equipment and list the maintenance items that should beperformed.3. Check the instructions and describe how to properly use the refrigerant handlingequipment.
7Inspect the Air Conditioning CondenserMeets NATEF Task: (A7-B-7) Inspect A/C condenser for airflow restriction; perform necessaryaction. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information on how to gain access to the front side of the condenser(describe what needs to be done).2. What is the recommended method and/or tools needed to clean the condenser?3. Based on the inspection, what is the necessary action?
8Receiver/Drier Accumulator DrierMeets NATEF Task: (A7-B-8) Remove, inspect, and reinstall drier assembly; determinerequired oil quantity. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the procedure and tools needed to remove the drierassembly.2. Check service information and determine the required amount of oil needed to beadded to the system if the drier assembly is replaced. oz.3. What was the condition of the removed drier assembly?
9Replace Expansion Valve/Orifice TubeMeets NATEF Task: (A7-B-9) Remove and install expansion valve or orifice tube.(P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the exact procedures to follow when replacing theexpansion valve or orifice tube.2. List the tools needed to perform the removal and installation of the expansion valve ororifice tube.a.d.g.b.e.h.c.f.i.
10Blower Motor DiagnosisMeets NATEF Task: (A7-D-1) Inspect and test A/C blower motor and circuit; performnecessary action. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Locate the blower motor schematic and determine the following information:A. Describe the locationB. Is the blower motor accessible from inside the vehicle or from under the hood?C. List the wire colors and their gauge:Power Ground 2. List the specified testing procedure:3. How are the various speeds controlled?Resistor packElectronic controllerOther (describe)4. What fuse number (label) and amperage rating are used for the blower motor?A. Fuse number (label)B. Fuse rating5. Describe the location of the ground(s) for the blower motor circuit.6. Measure the current draw of the blower motor on high speed.Amperage (normal blower motor amperage draw is about 12-14amperes)7. Based on the test results, what is the necessary action?
11A/C and Heater ControlsMeets NATEF Task: (A7-D-3, A7-D-4, A7-D-5) Inspect and diagnose malfunctions withHVAC controls. (P-2, P-3, P-3)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check for proper operation of the vacuum, mechanical, and electrical components andcontrols of the HVAC system. Describe the operation and/or faults detected.2. Check the operation of the A/C heater control panel assembly. Describe the operationand/or faults detected.3. Check the operation of the AC heater control cables (if equipped) and motors.Describe the operation and/or faults detected.4. Based on the inspection, what is the necessary action?
12Test and Replace CoolantMeets NATEF Task: (A1-D-7) Test coolant; drain and recover coolant; flush and refill coolingsystem with recommended coolant; bleed air as required. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the recommended coolant testing, recover, flushing, andrefilling procedures.2. What is the recommended coolant?3. Is the cooling system equipped with bleeder valves to help with bleeding trapped airfrom the cooling system when it is refilled?No Yes (describe location)
13Cooling System InspectionMeets NATEF Task: (A7-C-1) Perform cooling system pressure tests; perform necessaryaction. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check the level of coolant in the coolant recovery tank. It should be between the “fullhot” and “full cold” lines.OKNOT OK2. After the engine has cooled, remove the radiator cap.CAUTION: Do not remove the radiator cap if the engine is hot. The coolantwill explosively expand when the cap is removed which can cause severe burns toanyone near the vehicle.3. The coolant should be at the full level in the radiator.OKNOT OK4. Check the freezing point and boiling point of the coolant.Freezing point [should be -34 F (-36 C) or lower]Boiling point OKNOT OK5. Pressure test the cooling system by installing acooling system pressure tester and pump untilthe pressure is equal to the pressure cap value.Pressure should hold if there are no leaks.OKNOT OK6. Test the radiator cap using the cooling systempressure tester with an adapter that fits the cap.The cap should hold its rated pressure.OKNOT OK7. What is the necessary action?
14Heating System Performance CheckMeets NATEF Task: (A7-A-1, A7-C-2) Diagnose temperature control problems; determinenecessary action. (P-2)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check the front of the radiator and air-conditioning condenser for debris that couldlimit airflow. Clean as required.OKNOT OK2. Perform a thorough visual inspection of the cooling system. Look for hoses that maybe leaking, cut, or swollen.OKNOT OK3. Start the engine and operate the heater and air-conditioning controls for properoperation including:defroster (airflow to windshield)OKNOT OKheater (airflow to floor)OKNOT OKA/C (airflow to vents)OKNOT OKblower motor on all speedsOKNOT OK4. Using an infrared pyrometer, measure the temperature of the upper radiator hose.Temperature (should be close to the same temperature as thethermostat rating)OKNOT OK5. Based on the test results, what is the necessary action?
15Heater System ServiceMeets NATEF Task: (A7-C-3, A7-C-4) Inspect and test heater control valve(s); performnecessary action. (P-2) / Remove heater core. (P-3)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the specified procedures to follow to test the heatercontrol valves.2. Based on the inspection of the heater control valve(s), what is the necessary action?3. Remove and install heater core as needed.
16A/C Ducts and DoorsMeets NATEF Task: (A7-C-3, A7-D-6) Diagnose temperature control problems in the heatingsystem and determine procedures. (P-2)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check the operation of the heating and ventilation system. Describe the operationand/or faults detected.2. Based on the inspection, what is the necessary action?
17HVAC Electrical ControlsMeets NATEF Task: (A7-D-1) Diagnose malfunctions in the HVAC electrical controls;determine necessary action. (P-2)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information and describe the specified procedures to follow to diagnoseHVAC electrical control faults.2. Check all of the test equipment specified that is needed to diagnose HVAC electricalcontrol faults.a. DMMb. Scan toolc. Special tester (describe)d. Other (describe)3. After diagnosis following the specified procedures, what is the necessary action?
18Automatic/Dual Climate System IDMeets NATEF Task: (A7-A-2) Research vehicle and service information. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information and identify the type of automatic or dual climate systemand check all that apply:automatic systemdual climate systemsemi-automatic system2. Check service information and determine what sensors are being used and where theyare located.a. Ambient air temperature sensor; locationb. Evaporator outlet temperature sensor; locationc. Passenger component temperature sensor; locationd. Sunload sensor; locatione. Other (describe) ; location3. Describe the location of the other major components of the system.Compressor(s); locationEvaporator(s); locationBlower motor(s); location
19Automatic AC System OperationMeets NATEF Task: (A7-A-9, A7-D-8) Check operation of automatic HVAC system;determine necessary action. (P-3)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the specified procedures to follow to inspect and testthe A/C system operation. Describe the procedures.2. What test equipment was specified to test the A/C system operation? Check all thatapply.a. DMMb. Scan toolc. Special tester (describe)d. Other (describe)3. Based on the test results, what is the necessary action?
20Hybrid Vehicle A/C System PrecautionsMeets NATEF Task: (A7-B-4) Identify hybrid vehicle A/C system electrical circuits, service,and safety precautions. (P-3)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the vehicle manufacturer’s specified safety precautionsregarding the A/C system electrical circuits, safety, and service.A. Electrical circuit precautions:B. Safety precautions:C. Service precautions:
21Hybrid A/C System CircuitsMeets NATEF Task: (A7-B-4) Identify hybrid vehicle A/C system circuits and safetyprecautions. (P-3)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the specified A/C system electrical circuits precautions.2. What is the part number of the specified refrigerant oil that should be used whenservicing the air conditioning system?3. List the A/C service procedures that can be performed.
22Inspect A/C Compressor Drive BeltMeets NATEF Task: (A7-B-1) Inspect and replace A/C compressor drive belts, pulleys, andtensioner; determine necessary action. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the specified procedure to follow to inspect and replacethe A/C compressor drive belt, pulleys, and tensioners. Describe the specifiedprocedures.2. Describe the condition of the following items: A/C compressor drive belt A/C compressor drive belt pulleys A/C compressor drive belt tensioners3. Based on the inspection, what is the necessary action?
23Check A/C Condenser for Airflow RestrictionMeets NATEF Task: (A7-B-3) Inspect A/C condenser for airflow restrictions; performnecessary action. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the specified procedure to follow to get access to thecondenser for inspection. Describe the procedure.2. The specified procedure includes (check all that apply):Hoisting the vehicleRemoving the grilleRemoving the air damOther (specify)3. What is the specified method to use to clean the condenser?4. Based on the inspection, what is the necessary action?
24Cooling and Heater Hose InspectionMeets NATEF Task: (A7-C-1) Inspect engine cooling and heater system hoses; performnecessary action. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for specified procedures to follow for inspecting enginecooling and heater system hoses. Describe specified procedure.2. The specified inspection procedure includes the following (check all that apply).Visual inspectionPressure testing the cooling systemOther (describe)3. Based on the inspection, what is the necessary action?
25Inspect Cabin Filter and A/C DuctsMeets NATEF Task: (A7-D-1) Inspect A/C-heater ducts, doors, hoses, cabin filter, and outlets;perform necessary action. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the specified procedure to follow to inspect the airflowducts and cabin filter. Describe the specified procedure.2. Describe the location of the cabin filter:3. Check for proper airflow from the following vents (both left and right): DefrosterOK NOT OK Heater (floor vents)OK NOT OK Dash ventsOK NOT OK4. Based on the inspection, what is the necessary action?
26Identify Source of A/C OdorsMeets NATEF Task: (A7-D-2) Identify source of A/C odors. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the specified procedure to follow to determine andcorrect A/C system odors. Describe the specified procedure.2. Odors are usually caused by moisture and the growth of mold, mildew, fungi, bacteria,as well as odors from food or smoking residue. The specified treatment includes(check all that apply).Use of a deodorizerInstallation of an “after blow” kit that keeps the blower motor operating forseveral minutes after the engine has been stopped to dry out theevaporator.Other (specify)
27Hybrid Vehicle A/C System PrecautionsMeets NATEF Task: (A7-B-1-2) Identify hybrid vehicle A/C system electrical circuits,service, and safety precautions. (P-3)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the vehicle manufacturer’s specified safety precautionsregarding the A/C system electrical circuits, safety, and service.A. Electrical circuit precautions:B. Safety precautions:C. Service precautions:
28Identify and Recover RefrigerantMeets NATEF Task: (A7-E-1, A7-E-2) Identify and recover the air conditioning systemrefrigerant. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check the instructions for the refrigerant identifying unit and describe the recommendedprocedure.2. What did the identifying unit indicate was in the A/C system?CAUTION: If contaminated, do not recover the refrigerant unless a separatecontainer is used for the contaminated refrigerant.3. Following the equipment manufacturer’s instructions, recover the A/C system refrigerant.4. How much refrigerant was recovered?5. How much oil was recovered?
29Recycle RefrigerantMeets NATEF Task: (A7-E-3) Recycle the refrigerant. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check the operating instructions for the recycling machine and describe the proceduresspecified.2. How many ounces were recycled?3. What cautions or warnings were included in the instructions?
30Evacuate and Charge A/C SystemMeets NATEF Task: (A7-E-4) Evacuate and charge air conditioning system.(P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 4321. Check the underhood decal or A/C pressure fittings to verify the type of refrigerantthat should be in the system. CFC-12 HFC-134a other2. Connect an A/C refrigerant identification to the fitting and determine the type ofrefrigerant that is in the system. CFC-12 HFC-134a other(Do not proceed with the recovery unless the refrigerant is properly identified.)3. Connect the hoses from the recovery unit to both the high-side and low-side fittings.4. Recover the refrigerant and note the amount of refrigerant oil that was removed fromthe system. Amount of refrigerant oil recovered 5. Repair any leaks in the system and/or replace any failed component.NOTE: Most vehicle manufacturers recommend replacing the accumulator orreceiver drier if the system has been open for any length of time or if thecompressor has failed.6. Evacuate the system to a vacuum of at least 27” Hg (best if 29” Hg) for at least 45minutes.Lowest vacuum level reached Time spent evacuating 7. Recharge the system with the specified amount of refrigerant.8. Start the engine and check the high-side and the low-side pressures:low-side pressure high-side pressure 9. Check the temperature of the air from the center air-conditioning vent.Air temperature [should be 35 - 45 F (2 - 7 C)]OKNOT OK1
31Air-Conditioning System Performance TestMeets NATEF Task: (A7-A-1, A7-A-3) Performance test the A/C system and diagnose usingprinciples of refrigeration. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 4321NOTE: This test procedure is best performed when the temperature is above 70 F (21 C).1. Start the engine, turn the air conditioning to maximum cooling, open the doors andwindows, and increase engine speed to about 1500-2000 RPM.2. Turn the blower motor to high speed.3. Measure the temperature of the air at the air-conditioning vent in the center of thedash.Temperature [should be 35 - 45 F (2 - 7 C)]OKNOT OK4. Stop the engine and visually inspect the condition of the air-conditioning compressordrive belt (accessory drive belt).OKNOT OK5. Visually check for any signs of leaking refrigerant oil that could indicate a refrigerantleak.OKNOT OK
32Air Conditioning Noise DiagnosisMeets NATEF Task: (A7-A-4) Diagnose abnormal operating noise; determine necessaryaction. (P-2)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information for the suggested method and procedures to follow whendiagnosing abnormal noise concerns (describe procedure):2. Describe the noise (check all that apply):a. Under the hoodb. Inside the passenger compartmentc. Wind noised. Rattlee. Shriekf. SquealOther (describe):3. After diagnosis of the noise using the recommended procedures, what is the necessaryaction?
33Refrigerant Identification/Read PressuresMeets NATEF Task: (A7-A-5) Identify refrigerant type; connect the gauges and read thepressures. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Read, understand, and follow the instructions for the refrigerant identification machineanddetermine the type of refrigerant in the system.Type:Contaminated? YesNo If yes, state the results of the test:2. Connect the gauges as per the equipment manufacturer’s instructions:Low pressure High pressure
34Leak Test the Air Conditioning SystemMeets NATEF Task: (A7-A-6) Leak test the air conditioning system; determine necessaryaction. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information and describe the leak detection recommended by thevehiclemanufacturer.2. What type(s) of leak detection tools or equipment was used (describe)?3. Was a leak detected? Yes No If yes, describe the location:4. Based on the test results, what is the necessary action?
35Determine Need for Refrigerant FilterMeets NATEF Task: (A7-B-5) Determine the need for an additional A/C system filter;perform necessary action. (P-3)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information and determine when the vehicle manufacturer recommendsthe installation of an additional filter in the refrigerant system.2. Check aftermarket information and determine when an additional filter isrecommended to be installed.3. Where is an additional filter installed? (describe the location)4. Why is the filter installed in this location?5. What was the necessary action?
36AC System Performance CheckMeets NATEF Task: (A7-B-11) Perform test of air conditioning system. (P-1)Name Date Time on TaskMake/Model/Year VIN Evaluation: 4321NOTE: This test procedure is best performed when the temperature is above 70 F (21 C).1. Start the engine, turn the air conditioning to maximum cooling, open the doors andwindows, and increase engine speed to about 1500-2000 RPM.2. Turn the blower motor to high speed.3. Measure the temperature of the air at the air-conditioning vent in the center of thedash.Temperature [should be 35 - 45 F (2 - 7 C)]OKNOT OK4. Stop the engine and visually inspect the condition of the air-conditioning compressordrive belt (accessory drive belt).OKNOT OK5. Visually check for any signs of leaking refrigerant oil that could indicate a refrigerantleak.OKNOT OK
37Air Conditioning Control System DiagnosisMeets NATEF Task: (A7-D-3) Diagnose faults in the A/C, HVAC system; determinenecessary action. (P-2)Name Date Time on TaskMake/Model/Year VIN Evaluation: 43211. Check service information and describe the tests specified to diagnosis faults in thevacuum, mechanical, and electrical controls of the heating, ventilation, and airconditioning system (describe the tests).2.What test equipment was specified
Evacuate and Charge the Air Conditioning System (A7-E-4) 30 Chapter 15 - A/C System Diagnosis and Service Air Conditioning System Performance Test (A7-A-1, A7-A-3) 31 Air Conditioning Noise Diagnosis (A7-A-4) 32 Refrigerant Identification/Read Pressures (A7-A-5) 33 Leak Test the Air Conditioning System (A7-A-6) 34
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