Session 10: Introduction to Climate Control System Heating, Ventilation, and Air Conditioning in a Vehicle
Module 5: Auto Electrical System
Textual Question-Answers
Check Your Progress
Fill in the blanks
1. The climate control system is designed to provide comfort for the……………and…………..
Ans: driver and passengers
2. The HVAC system controls ………….. and the removal
of…………..
Ans: temperature, humidity
3. The heater element is kept hot by means of …………… of theradiator.
Ans: hot coolant
4. The ……….. operates similarly to the heater, using heat from thesame heater element. It directs hot air against the windshield to preventcondensation or freezing.
Ans: defroster
5. The purpose of the ……………. is to check whether the A/Csystem has the proper charge of refrigerant. It involves operating theA/C at maximum cooling capacity and observing the sight glass on thereceiver/dryer.
Ans: performance test
Multiple Choice Questions
1. The purpose of the climate control system in a vehicle is to:
a) Improve fuel efficiency
b) Enhance vehicle speed
c) Provide comfort for occupants
d) Increase engine performance
Ans: c) Provide comfort for occupants
2. Which of the following is NOT a subsystem of the HVAC system?a) Cooling system
b) Heating and defrosting system
c) Air distribution and ventilation system
d) Air conditioning system
Ans: a) Cooling system
3. The component that directs hot air against the windshield toprevent condensation or freezing is called the:
a) Vent door
b) Evaporator
c) Defroster
d) Compressor
Ans: c) Defroster
4. What is the purpose of the blower motor in a vehicle’s HVACsystem?
a) To control fuel injection
b) To drive the vehicle
c) To provide fresh air for ventilation
d) To charge the battery
Ans: c) To provide fresh air for ventilation
5. In an air conditioning system, the compressor is driven by a beltand pulley from the:
a) Radiator fan
b) Engine crankshaft pulley
c) Transmission
d) Alternator
Ans: b) Engine crankshaft pulley
6. What does the sight glass on the receiver/dryer of an A/C systemindicate?
a) Oil level
b) Engine temperature
c) Refrigerant charge state
d) Battery voltage
Ans: c) Refrigerant charge state
Answer the following questions
1. Discuss the importance of the climate control system, heating,
ventilation, and air conditioning in a vehicle.
Ans: The climate control system is important for providing comfort andsafety to vehicle occupants. Heating keeps the cabin warm in cold weather, ventilation supplies fresh air and removes stale air, and air conditioning cools the cabin and removes humidity. These systems improve driver alertness, prevent windshield fogging, and enhance overall driving comfort in all weatherconditions.
2. What do you mean by climate control in an automobile?Ans: Climate control in an automobile refers to the system that maintainsa comfortable cabin environment by regulating temperature, airflow, andhumidity automatically or manually, according to the needs of the occupants.
3. Write the functions of the Heater and Defroster in an automobile.
Ans: The heater provides warm air to the passenger compartment by usingengine heat to maintain comfort during cold conditions. The defroster directshot air onto the windshield and windows to remove condensation, fog, or ice,
ensuring clear visibility for safe driving.
4. Draw the operational circuit of an automobile air conditioningsystem and label different components.
Ans: The operational circuit of an automobile air conditioning systemincludes the compressor, condenser, receiver/dryer, expansion valve,
evaporator, blower motor, pressure switches, and connecting pipes, arrangedin a closed refrigerant flow circuit.
5. Explain different faults of the automobile air conditioning system,
their causes and remedies.
Ans: Common faults include insufficient cooling due to low refrigerant
level or compressor fault, noisy operation caused by worn bearings, and nocooling due to blocked condenser or faulty expansion valve. Remedies includerecharging refrigerant, repairing or replacing faulty components, cleaning thecondenser, and checking electrical controls.
Activity
1. Make a list of components of the air conditioning system of avehicle.
Ans:
1. Component: Compressor
2. Component: Condenser
3. Component: Receiver/dryer
.4. Component: Evaporator
2. Prepare a poster showing a circuit diagram of the air conditioningsystem of a vehicle.
Ans: The poster should show a labeled circuit diagram of the automobileair conditioning system including compressor, condenser, receiver/dryer,
expansion valve, evaporator, blower motor, and refrigerant flow direction.
Try yourself.
