Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 55, Problem 4MC
All of the following are true statements about flushing an A/C system after a compressor failure, except
- The condenser must be flushed and the receiver/ dryer replaced.
- Filter screens are sometimes located in the suction side of the compressor and in the receiver/dryer. These screens confine foreign material to the compressor, condenser, receiver/dryer, and connecting hoses.
- Use only CFCs for flushing. After the system has been flushed, be sure to oil all components that require it.
- Some manufacturers recommend replacing the clogged components and installing a liquid line (inline) filter just ahead of the expansion valve or orifice tube instead of flushing the system.
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All of the following are true statements about flushingan A/C system after a compressor failure, except __ .a. the condenser must be flushed and the receiver/dryer replacedb. filter screens are sometimes located in the suctionside of the compressor and in the receiver/dryer.These screens confine foreign material to thecompressor, condenser, receiver/dryer, and connectinghosesc. use only CFCs for flushing. After the system hasbeen flushed, be sure to oil all components thatrequire itd. some manufacturers recommend replacing theclogged components and installing a liquid line(inline) filter just ahead of the expansion valve ororifice tube instead of flushing the system
1-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…
For a hydraulic power unit, this part protects the pump from taking in any harmful particles that may be in the reservoir
a. liquid level gauge
b. filler/breather
c. pressure gauge
d. suction strainer
Chapter 55 Solutions
Automotive Technology
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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- Technician A says that some refrigerant leaks can also be traced to pinholes in the evaporator caused by acid, which forms when water and refrigerant mix. Technician B says that leaks are most often found at the compressor hose connections and at the various fittings and joints in the system. Who is correct? Technician A only Technician B only Both A and B Neither A nor Barrow_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_forwardExcluding lines, which of the following components are required to make simple hydrolic system? A) Reservoir, pump, filter & regulator. B) Reservoir, ACOV, pressure relief valve & actuator. C) Reservoir, pump, selector valve & actuator.arrow_forward
- Why is it important to change the oil on a vacuum pump after each evacuation?arrow_forwardA one-pipe system may be used when the oil tank is higher or lower than the oil pump. True or false.arrow_forwardWhen checking an A/C system, the evaporators inlet and outlet tubes feel like they are at the same temperature. Which of these could cause this? A plugged evaporator Correct charge of refrigerant in the system Restricted orifice tube Leaking condenserarrow_forward
- Explain how the oil separator, oil reservoir, pressure differential valve, and oil-level regulators work together tomaintain the correct oil level in parallel compressors.arrow_forwardTrue or false flow rate control valve is the type of valve which is used to control the speed of an actuatorarrow_forwardWhich of the following is NOT found in a pre-injection fluid? A. low concentration of formaldehyde B. anticoagulants C. high concentration of formaldehyde D. water conditioning agentsarrow_forward
- What kind of circuit balancing valve is used in the hot and chilled water piping? a. balancing globe valve b. shut-off balancing valve c. pressure balancing valve d. pressure by-pass valvearrow_forwardThe amount of fluid allowed to enter the cylinder can be controlled, this is done with the use of a/an ______________ control valve.arrow_forwardFluids added to the injection mixture in the reservoir to address specific problems of the case being embalmed are called ___ fluids. related restricting accessory supplementalarrow_forward
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