Automotive Climate Control Systems
Review Questions
Course Introduction
This course explores the principles, design, operation, and service of climate control systems in modern automobiles, including heating, ventilation, and air conditioning (HVAC). Students will gain a comprehensive understanding of thermodynamics as applied to automotive environments, component function (compressors, condensers, evaporators, controls), refrigerant properties and handling, and system diagnostics. The course also addresses emerging technologies such as automatic climate control, eco-friendly refrigerants, and integration with vehicle electronics, preparing students for maintenance and troubleshooting of both conventional and advanced automotive climate control systems.
Recommended Textbook
Todays Technician Automotive Heating Air Conditioning Classroom Manual and Shop Manual 5th
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13 Chapters
631 Verified Questions
631 Flashcards
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2
Chapter 1: Heating and Air Conditioning - History and the Environment
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48 Verified Questions
48 Flashcards
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Sample Questions
Q1) The Clean Air Act is being discussed.<i>Technician A</i> says the Montreal Protocol is one of the results of the Clean Air Act.<i>Technician B</i> says it gave the EPA authority to control refrigerants in order to protect the environment.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Answer: B
Q2) The EPA is a federal regulatory agency.
A)True
B)False
Answer: True
Q3) What does the word toxicity mean?
Answer: poisonous quality
Q4) What should the technician do before loosening bolts or screws on a refrigeration system?
Answer: Make sure the pressure inside the part has been relieved.
Q5) List four major components of chlorofluorocarbons (CFCs,freon,and halons). Answer: chlorine,fluorine,carbon,hydrogen
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Chapter 2: Temperature and Pressure Fundamentals
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43 Flashcards
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Sample Questions
Q1) One British thermal unit (Btu)contains ____ calories.
A) 144
B) 212
C) 252
D) 970
Answer: C
Q2) The sun heats the earth through the process of A) convection.
B) conduction.
C) radiation.
D) all of the above.
Answer: C
Q3) Identify the components of a molecule of water.Explain why the water molecule differs from its component elements.
Answer: A water molecule consists of two atoms of hydrogen and one atom of oxygen.The combination of two elements,both gas ions in their natural state,produces a liquid that is unlike either.
Q4) What unit of measurement is resistance in an electrical circuit meased in?
Answer: Ohm's
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Chapter 3: Engine Cooling and Comfort Heating
Systemsdiagnosis and Service of Engine Cooling and Comfort Heating Systems
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57 Verified Questions
57 Flashcards
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Sample Questions
Q1) After a vehicle has been driven for 10-15 miles,the heater still continues to blow cool air.Which of the following is the most likely cause?
A) Faulty water pump impellers.
B) Partially blocked radiator.
C) Thermostat stuck closed.
D) Partially blocked heater core.
Answer: D
Q2) What is a PTC heater and on what vehicles can it be found?
Answer: The PTC heater is a positive temperature coefficient electric heating element that is integrated into a conventional heater core used to supplement the comfort heating system to maintain passenger compartment at the desired temperature.The PTC heater is found on some hybrid and direct injection internal combustion engines either gasoline or diesel powered.
Q3) All of the following statements about engine cooling are true,EXCEPT:
A) Engine heat is transferred to the coolant.
B) Coolant heat is transferred to the ambient air.
C) Heat transfer is through conduction and radiation.
D) Much of the heat generated in the engine leaves through the exhaust system.
Answer: C
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Chapter 4: Air-Conditioning System Operating
Principlesthe Manifold and Gauge Set
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50 Flashcards
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Sample Questions
Q1) The low-side gauge is capable of reading a vacuum when necessary.
A)True
B)False
Q2) What is the heart of the refrigerant system?
Q3) Where is the refrigerant system desiccant located?
Q4) A modern air conditioner system will have either an accumulator or a receiver-drier but not both.
A)True
B)False
Q5) <i>Technician A </i> says there is a common passage on a manifold and gauge set.<i>Technician B </i> says both hand valves on a manifold and gauge set must be closed to read service pressures.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q6) What is the function of the refrigerant condenser?
Q7) What does the term relative <i>humidity mean</i>?
Q8) The basic diagnostic tool used on a refrigerant system is the? Page 6
Q9) What is the main chemical advantage of R-134a refrigerant over R-12 refrigerant?
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Page 7
Chapter 5: Refrigerant System Componentsservicing
System Components
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44 Flashcards
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Sample Questions
Q1) If a system has a thermostatic expansion valve,it will also have all of the following parts,EXCEPT:
A) accumulator.
B) compressor.
C) condenser.
D) receiver-drier.
Q2) <i>Technician A</i> says in an H-block valve the temperature sensing sleeve (bulb)is internally located in the outlet port of the valve.<i>Technician B</i> says the operation and function of the H-valve,or block valve,are essentially the same as the thermostatic expansion valve (TXV).Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) Describe the two major functions of the air conditioning system compressor.
Q4) What effect will bent cooling fins on the condenser have on the refrigerant system?
Q5) What is the function of the orifice tube?
Page 8
Q6) Why must the condenser outlet be at the bottom?
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Chapter 6: Refrigerant System Servicing and
Testingair-Conditioning System Servicing and Testing
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51 Verified Questions
51 Flashcards
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Sample Questions
Q1) A technician determined that all the refrigerant had leaked out of the A/C system.<i>Technician A</i> says that the low-pressure switch will need to be replaced before the the system can be recharged.<i>Technician B</i> says that the low pressure switch will need to be adjusted before the system can be recharged.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q2) Dye leak detectors are being discussed.<i>Technician A</i> says injection dye will be visible after a few days of system operation if a leak is present.<i>Technician B</i> says a special lamp is required to locate a leak with fluorescent dye.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) R-134a is more likely to absorb moisture than R-12.
A)True
B)False
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Chapter 7: Diagnosis of the Refrigeration System
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53 Flashcards
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Sample Questions
Q1) R-134a has the exact same temperature and pressure relationship as R-12.
A)True
B)False
Q2) What is the real hazard of excessive concentrations of refrigerants in the service area,whether or not they have contacted an open flame?
Q3) What can a defective compressor cause systems pressures to be?
Q4) While a technician is performing an A/C system performance test,it is determined that the low pressure gauge is reading in the vacuum range.This reading could be caused by:
A) an overcharged refrigerant system.
B) a flooded evaporator
C) a restricted expansion valve
D) service hoses are connected to the incorrect system ports.
Q5) Ice on the evaporator coil is often a normal condition.
A)True B)False
Q6) If a refrigerant system is contaminated with moisture what would you expect to see on the low-side and high-side guages?
Q7) What should you do first before condemning a refrigerant system component?
Page 10
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Chapter 8: Compressors and Clutches
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Sample Questions
Q1) How are all air conditioning compressor clutches applied and released?
Q2) Why is it important that the compressor seals not be touched with the fingers?
Q3) The most common type of compressors used on todays vehicles is the cam lock design.
A)True
B)False
Q4) <i>Technician A</i> says some compressor service procedures can be performed on the vehicle if space permits.<i>Technician B</i> says modern compressors can be removed and reinstalled without discharging the rest of the system.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q5) If a bearing shows signs of excessive noise,binding,or looseness,it should be regreased.
A)True
B)False
Q6) Explain the concept of reciprocating pistons as used in automotive air conditioning compressors.
Page 11
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Chapter 9: Case and Duct Systems
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52 Verified Questions
52 Flashcards
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Sample Questions
Q1) How are pollen and dust particles stopped from entering the passenger compartment.
Q2) On most systems all incoming air passes through the heater core.
A)True
B)False
Q3) The blower can be installed upstream or downstream of the other components.
A)True
B)False
Q4) In the case and duct system the air distribution mode doors may be operated by all of the following Except:
A) Potentiometers
B) Electrically powered motors
C) Cable
D) Vacuum motors
Q5) When should the cabin air filter be replaced if the vehicle is operated in dusty or high pollution conditions?
A) Every 3 months or 3,000 miles.
B) Once a year or every 12,000 miles.
C) Every 15,000 miles.
D) Every 30,000 miles.
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Chapter 10: System Controlsdiagnosis and Service of
System Controls
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49 Verified Questions
49 Flashcards
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Sample Questions
Q1) Electronic control heads are being discussed.<i>Technician A</i> says all units have a connection to use a scan tool or diagnostic tool.<i>Technician </i> says the different brands use the same trouble code to indicate the same failure.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q2) <i>Technician A</i> says a fuse can be replaced with one having a higher rating if the original size fuse keeps blowing.<i>Technician B</i> says it is always acceptable to replace a fuse with one having a lower rating.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) If blower motor speed control is provided by resistors,the motor will have three windings.
A)True
B)False
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Chapter 11: Retrofit and Future Trends
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Sample Questions
Q1) When should a saddle clamp access valve be installed?
Q2) What is the advantage of placing the vehicle in a draft-free work area?
Q3) All of the following statements about thermostatic expansion vales on retrofitted systems are true,EXCEPT:
A) The expansion valve does not have to be replaced when retrofitting a system from R-12 to R-134a.
B) If a defective expansion valve is replaced, always use a model designed for the system refrigerant.
C) A R-12 expansion valve used in an R-134a system will result in higher superheat and reduced evaporator efficiency.
D) An R-134a valve used in a R-12 system will have reduced superheat.
Q4) What questions should the technician ask the customer if there is a possibility that the refrigerant is contaminated?
Q5) Why is it important to affix decals to identify a new refrigerant type?
Q6) Which of the following desiccants should be used with HFC-134a refrigerant?
A) XH5
B) XH7
C) XH9
D) Both B and C
Page 14
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Chapter 12: Extenssion 1: Shop Safety
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54 Verified Questions
54 Flashcards
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Sample Questions
Q1) What is OSHA?
Q2) What should the technician do before loosening bolts or screws on a refrigeration system?
Q3) <i>Technician A</i> says you should always disconnect the power source while working on electric cooling fan motors.<i>Technician B</i> says it is safe to work on electric cooling fan motors when the ignition switch is off.Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B
Q4) Any hazardous materials that strike the skin should be washed off A) immediately.
B) within 24 hours.
C) after work.
D) none of the above.
Q5) Explain the safety precautions that should be taken when running an engine in a shop.
Q6) What are the characteristics of carbon monoxide gas.
Q7) What should be added to a battery if its liquid level is low.
Page 15
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Chapter 13: Extenssion 2: Typical Shop Procedures and Tools
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35 Verified Questions
35 Flashcards
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Sample Questions
Q1) No special equipment is required to service HFC-134a (R-134a)refrigerant systems.
A)True
B)False
Q2) Explain why it is important to consult service information when working on any type of air conditioning system.
Q3) Why are shop rules and regulations put in place?
Q4) What is your employer expected to supply first and foremost?
Q5) All of the following are method of detecting refrigerant leaks EXCEPT:
A) Halogen detector
B) Soap solution
C) hepide detector
D) Fluorescent dye
Q6) <i>Technician A </i> says to use the VIN to collect the correct repair information.<i>Technician B </i>says repair procedures will cover diagnostic routines and methods to perform the repair.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
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