Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 55, Problem 11RQ
While conducting a pressure test on an A/C system, the ambient temperature is 80°F, the low-side gauge reads low (8 psi), and the high side also reads low (85 psi). Which of these could cause these readings?
- Low refrigerant level
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Choose True or False
1.During a refrigerant system performance test the following results are recorded: outside ambient temperature of 908F, high-side gauge reading of 145 psi, and low pressure gauge reading of 14 psi. What is indicated by these results?
A. Faulty refrigerant compressor
B. Normal refrigerant system operation
C. Low refrigerant levels
D. A restriction on the high side of the refrigerant system
2. A customer complains of poor air-conditioning cooling performance. During a system performance test, the low-side gauge reading is 50 psig; the high-side gauge reading is 310 psig; and the ambient air temperature is 818F (27.228C). What is the least likely cause of the above results?
A. Restricted airflow through condenser
B. Refrigerant overcharge
C. Refrigerant undercharge
D. Overcharge of refrigerant oil
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Chapter 55 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 55 - What should you do if you suspect that an...Ch. 55 - Explain how dye can be used to find leaks in the...Ch. 55 - What is the purpose of the thermostatic switch in...Ch. 55 - Why should the probe of an electronic leak...Ch. 55 - How will air trapped in the A7C system affect...Ch. 55 - Which of the following statements best defines the...Ch. 55 - Which of the following statements is not true...Ch. 55 - To charge an air-conditioning system while it is...Ch. 55 - All of the following are true statements about...Ch. 55 - A very important part of a performance test on an...
Ch. 55 - While conducting a pressure test on an A/C system,...Ch. 55 - The high-side pressure on a system with a cycling...Ch. 55 - When checking an A/C system, the evaporators inlet...Ch. 55 - All of these are good reasons for replacing an...Ch. 55 - In an AZC system, if the low-side pressure is...Ch. 55 - Technician A says that evacuating (pumping down)...Ch. 55 - Technician A says that some refrigerant leaks can...Ch. 55 - Technician A says that the presence of oil around...Ch. 55 - Technician A says that a faulty accumulator will...Ch. 55 - Technician A says that air in the system can cause...Ch. 55 - Technician A feels up and down the face or along...Ch. 55 - Technician A says that a manifold gauge set can be...Ch. 55 - While discussing an inoperative blend air door:...Ch. 55 - Two technicians were discussing how comparing the...Ch. 55 - While conducting an A/C system performance test:...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Two technicians were discussing how comparing the temperature of a high-pressure line to that of a low- pressure line would help evaluate an A/C system when the system does not have a sight glass. Technician A says that the high-pressure line will feel warmer than the low-pressure line if the system is operating normally. Technician B says that both lines should feel cold after the system has been run for a while if the system is working normally. Who is right? Technician A only Technician B only Both A and B Neither A nor Barrow_forwardBefore installing a gauge on the high-pressure side of a system, you should do which of the following? A. Turn on the system. B. Turn off the system. C. Adjust the system to a neutral position. D. Have a cylinder approved by the DOT nearby.arrow_forward1-While refilling an 8-quart (7.57 L) system with coolant: Technician A initially puts in 4 quarts (3.78 L) of straight coolant and tops it off with water. Technician B fills the system with the correct mixture, tightens the radiator cap, and then checks for leaks. Who is correct? 2-While checking for conditions that might cause coolant electrolysis: Technician A places the positive lead of a voltmeter into the coolant and connects the negative lead to a ground. Technician B checks for the presence of voltage in the coolant with the ignition off. Who is correct? 3-Technician A says that if the PCV valve or connecting hoses become clogged, excessive pressure will develop in the crankcase and can cause oil leaks. Technician B says that if the PCV valve or connecting hoses become clogged, oil may be pushed into the air cleaner or cause it to be drawn into the intake manifold. Who is correct? 4-While bleeding air from a cooling system: Technician A loosens a heater hose at its highest…arrow_forward
- Identify the true statement from the following Venturimeter is a rate of flow measuring instrument O Venturimeter is use to measure velocity of liquid flowing through a cross-section O Piezometer is a flow measuring instrument O Pitot tube is a flow measuring instrumentarrow_forwardWhich of the following statements best defines the term evacuation? A process in which the refrigerant in a system is released. A condition that exists when a compressor runs until there is no refrigerant left in the system. The process that pulls all traces of air and moisture from the system. A process that uses air to force moisture and dirt out of the system.arrow_forwardWhat is thermocouple gauge used for detection of leaks in vacuum systems.arrow_forward
- When oil pressure is below the spring pressure, the switch opens and the gauge reading falls toward the low-pressure side. Select one: True Falsearrow_forwardTrue or FAlse: A compressor can compress a liquid.arrow_forwardTrue or False? A compression gauge will show the amount of air leaking through a cylinder as a percentage.arrow_forward
- For every pound of pressure put on engine coolant, the boiling point of the coolant is raised about. 2°F(1.1°C) 3°F(1.6°C) 4°F (2.2°C) 5°F(2.7°C)arrow_forwardIn an AZC system, if the low-side pressure is lower than normal, which of the following is the least likely cause? A faulty metering device Poor airflow across the evaporator A restriction in the low side of the system The system being overcharged with refrigerantarrow_forwardWhy does the high-pressure gauge on a regulator not always indicate the amount of gas in the cylinder?arrow_forward
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