Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Chapter 54, Problem 4SA
What is the purpose of the compressor clutch thermostatic switch?
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The A/C compressor cycles rapidly, and air coming from the vents is only slightly cool. Technician A says the problem could be a low refrigerant charge. Technician B says the problem could be a defective thermostatic switch. Who is right?
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Technician A
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Chapter 54 Solutions
Automotive Technology
Ch. 54 - What is the amount of heat necessary to change the...Ch. 54 - Explain how an electromagnetic compressor clutch...Ch. 54 - Describe four ways in which the heater control...Ch. 54 - What is the purpose of the compressor clutch...Ch. 54 - What does change of state mean? And why is it...Ch. 54 - What state is the refrigerant in when it leaves...Ch. 54 - What causes condensed water to leak from the air...Ch. 54 - Explain why a diode may be wired into the compres...Ch. 54 - On which of the following laws of nature is the...Ch. 54 - Which of the following statements is true?...
Ch. 54 - Which of the following statements is false? The...Ch. 54 - Which of the following statements about PTC...Ch. 54 - Which of the following is electrically connected...Ch. 54 - Which of the following oils is used in an original...Ch. 54 - A heating system includes all of the following...Ch. 54 - Technician A says that a great amount of heat is...Ch. 54 - Technician A says that suction lines become very...Ch. 54 - While discussing the reasons the use of R-134a is...Ch. 54 - While discussing the reaction by a refrigerant to...Ch. 54 - While discussing solar sensors: Technician A says...Ch. 54 - While discussing the future use of CO2 as a...Ch. 54 - Technician A says that when the A7C system is off,...Ch. 54 - Technician A says that when the refrigerant is...Ch. 54 - A heater does not supply enough heat and the...Ch. 54 - While discussing relative humidity: Technician A...
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- What is the purpose of the thermostatic switch in a cycling clutch system?arrow_forwardWhen should a service technician use the subcooling method of charging air-conditioning and heat pump systems?arrow_forwardWhich of the following is not a true statement about thermostats? Faulty thermostats are often the cause of air pockets in the coolant passages. They can also cause an increase in fuel consumption and poor engine performance. If the thermostat is stuck open, the coolant may not reach the desired temperature because it is cooled before it gets hot If a thermostat is stuck closed, coolant will not flow between the engine and radiator and the engine will quickly overheatarrow_forward
- The high-side pressure on a system with a cycling clutch and pressure cycling switch is 145 psi, the low-side pressure is 28 psi, and the ambient temperature is 78F. What do these gauge readings indicate? a. The system is undercharged. b. The system is overcharged. c. The system is normal. d. The evaporator pressure regulator is bad.arrow_forwardWhat is the purpose of the internal overload protector in the compressor motor?arrow_forwardHow does the automatic expansion valve respond to a load increase?arrow_forward
- The reversing-valve solenoid is energized on the _ cycle.a - heatingb - coolingarrow_forwardThe high-side pressure on a system with a cycling clutch and pressure cycling switch is 245 psi, the low- side pressure is 28 psi, and the ambient temperature is 78°F. What do these gauge readings indicate? The system is undercharged. The system is overcharged. The system is normal. The evaporator pressure regulator is bad.arrow_forwardWhat is the common name for an air flow switch?arrow_forward
- The two types of relays used to start hermetic compressorsare the _________ relay and the _________.arrow_forwardHow are mechanical cooling system clutch fans often engaged? Select one: a. A ratcheting mechanism b. A viscous fluid C. A pneumatic actuator d. A pressure switcharrow_forwardWhat is the primary purpose of a thermostat jiggle valve? Select one: a. To act as a bypass for coolant b. To relieve water pump pressure under load c. To ensure coolant flows the correct direction d. To aid in bleeding air from the systemarrow_forward
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