Two technicians are discussing testing coolant for proper pH. Technician A says that coolant has a pH above 7 when new and becomes lower with use in an engine. Technician B says that OAT and HOAT coolants have a lower pH when new compared to the od green IAT coolant. Which technician is correct?
- a. Technician A only
- b. Technician B only
- c. Both Technicians A and B
- d. Neither Technician A nor B
Want to see the full answer?
Check out a sample textbook solutionChapter 20 Solutions
Automotive Technology: Principles, Diagnosis, And Service; My Automotive Lab With Pearson Etext -- Access Code Card -- For Automotive Technology; ... For Automotive Technology (5th Edition)
Additional Engineering Textbook Solutions
DeGarmo's Materials and Processes in Manufacturing
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
Fundamentals of Heat and Mass Transfer
DESIGN OF MACHINERY
Vector Mechanics for Engineers: Statics
Vector Mechanics for Engineers: Statics and Dynamics
- 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_forwardWhy is a plastic or metal restrictor placed in either the end of the vent pipe or in the vapor-vent hose on some vehicles?arrow_forwardWhen condenser tubes become fouled, they may be cleaned by A. using a steel brush. B. using a brass brush. C. using a chisel and hammer. D. running a mixture of sand and water through them.arrow_forward
- While discussing the future use of CO2 as a refrigerant: Technician A says that CO2 is nontoxic and presents little threat to the environment. Technician B says that only slight changes from conventional systems will be required because CO2 systems operate at low pressures and temperatures. Who is correct? Technician A only Technician B only Both A and B Neither A nor Barrow_forwardAll 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 systemarrow_forward9. While preparing to remove an engine: Technician A disconnects the refrigerant lines at the air-conditioning compressor and allows the refrigerant to totally leak out before removing the compressor. Technician B installs plugs in the ends of the refrigerant hoses after they have been disconnected. Who is correct?arrow_forward
- When 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_forwardDescribe the difference between an azeotropic refrigerant blend and a near-azeotropic or zeotropic refrigerant blend.arrow_forwardDescribe the function of an electric evaporator pressure-regulating (EEPR) valve.arrow_forward
- Automotive Technology: A Systems Approach (MindTa...Mechanical EngineeringISBN:9781133612315Author:Jack Erjavec, Rob ThompsonPublisher:Cengage LearningAutomotive TechnologyMechanical EngineeringISBN:9781337794213Author:ERJAVEC, Jack.Publisher:Cengage,Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning