Cool Dude
The 3 things required at a 3 wire pressure sensor for the system to work include all except for:
A. 12 volt power
B. pressure sensor signal
C. 5 volt reference
D. Sensor ground
A. 12 volt power
When moisture is left in an A/C system and it mixes with refrigerant, it creates acid
A. True
B. False
A. True
Which of the following is the LEAST accurate way to charge an A/C system?
A. Install the amount of refrigerant specified in the vehicle factory manual
B. Recover, vacuum, recharge the system to the manufacturer’s specifications
C. Adding refrigerant until the air is cold out of the vents
D. Use the pressure gauges and the evaporator temperature to evaluate the refrigerant level
C. Adding refrigerant until the air is cold out of the vents
What is the recommended time for proper system evacuation?
A. 20 minutes
B. 15 to 30 minutes
C. 30 to 45 minutes
D. 60 minutes
C. 30 to 45 minutes
Which of the following scenarios can result in air-contaminated refrigerant?
A. A large leak during recovery
B. A leaking o-ring inside a coupler
C. Improper operation of the recovery machine
D. All the above
D. All the above
What is the new A/C certification required for technicians?
A. 608
B. 609
C . 708
D. 709
B. 609
Placing the system in a vacuum will remove the air and moisture.
A. True
B. False
A. True
PAG can be used in electrically operated A/C compressors found on many hybrid vehicles.
A. True
B. False
B. False
Tech A states that an accumulator A/C system may require additional time and precautions to remove the entire amount refrigerant. Tech B states that all types of MVAC systems take the same recovery time. Who’s correct?
A. Tech A
B. Tech B
C. Both
D. Neither
A. Tech A
Tech A states that you can recycle non-contaminated refrigerant on site. Tech B states that contaminated refrigerant must be sent off to an EPA approved site. Who’s correct?
A. Tech A
B. Tech B
C. Both
D. Neither
C. Both
What is the first equipment requirement of a 1234yf service system?
A. Manifold gauge set
B. Leak detector
C. Identifier
D. UV light
C. Identifier
What additive is used in the 2011 F-250 6.7L diesel engine cooling system to revitalize the coolant if needed when the 15,000 mile “check coolant additive” warning comes on?
A. VC12 Coolant Revitalizer
B. Acid Flush
C. Coolant Stopleak
D. Ethanol Glycol
A. VC12 Coolant Revitalizer
SAE J2788 requires that a recovery machine should be able to measure the refrigerant amount to within?
A. 0.2 of an ounce
B. 0.5 of an ounce
C. 1.0 of an ounce
D. 0.75 of an ounce
ASHRAE has determined that HFO-1234yf is ‘mildly flammable’.
A. True
B. False
A. True
For a shop that already does air conditioning service and wants to start working on HFO-1234yf, they will need:
A. A HFO-1234yf recovery, recycling and recharging machine
B. The service technicians to be Section 609 certified
C. A well-ventilated work area
D. All of the above
D. All of the above
Why are oil separators used in modern compressors? Select all the apply
A. Improves Fuel Economy
B. Help find leaks in the system
C. Less energy required to operate
D. Better lubrication for compressor
D. Better lubrication for compressor
In the 2007 Subaru Legacy Case Study overheat, what was the cause?
A. Headbolts, Gasket Sealings, & Cylinder Heads
B. Wrong Coolant
C. Cooling Fans
D. Thermosta
A. Headbolts, Gasket Sealings, & Cylinder Heads
When should you replace the recycling equipment filter?
A. Every 6 months of operation
B. Every month of operation
c. Once every 25 completed jobs
D. According to the manufacturer’s specifications
D. According to the manufacturer’s specifications
Two technicians are discussing air in an A/C system. Tech A says air can lead to poor A/C performance. Tech B says that air in the refrigerant can make the system run at a higher pressure. Who’s correct?
A. Tech A
B . Tech B
C. Both
D. Neither
C. Both
A technician has just examined a system and has found the refrigerant has been contaminated. What should the technician do now?
A. Run through two or more cycles with on-site equipment to purify refrigerant
B. Send the refrigerant to an EPA certified site for reclamation or destruction
C. Purify refrigerant by letting it sit in a dark room for at least 24 hours
D. Release refrigerant into the atmosphere
C. Purify refrigerant by letting it sit in a dark room for at least 24 hours
What procedure was used to determine the cause of the no heat complaint. Technician A says to bleed the airpocket out of cooling system. Technician B says bring the engine to temperature, turn it of and remove spark plugs, pressurize cooling system and leave overnight to inspect for coolant in cylinders. Who is correct?
A. Technician A
B. Technician B
C. Both Technicians A and B
D. Neither Technician A or B
Tech B
B. Technician B says bring the engine to temperature, turn it of and remove spark plugs, pressurize cooling system and leave overnight to inspect for coolant in cylinders.
ech A states that a shop owner has to be 609 certified. Tech B states all techs that service a MVAC system have to be 609 certified. Who’s correct?
A. Tech A
B. Tech B
C. Both
D. Neither
Tech B
B. Tech B states all techs that service a MVAC system have to be 609 certified.
Using a refrigerant identifier greatly improves your ability to determine if you have the right type of refrigerant and the purity of that refrigerant.
A. No, it has no advantage
B. No, it allows you to determine if the system is at correct pressure
C. No, it’s for topping off the system
D. Yes, it allows you to determine the type of refrigerant
D. Yes, it allows you to determine the type of refrigerant
Two technicians are discussing a leak in an A/C system. Tech A says there is no federal law against servicing a leaky system. Tech B says that in some areas of the country, local laws may state you have to repair a leaking system before servicing. Who’s correct?
A. Tech A
B. Tech B
C. Both
D. Neithe
C. Both
HFO-1234yf recovery systems must have a service valve no further than 12 inches from the vehicle service ports.
A. True
B. False
A. True
A technician has recovered R-134a from a vehicle using an R/R/R machine. During the 5 minute pause, the low side gauge rises slightly from vacuum into pressure. Following the second recovery, how long must the system remain in a stable vacuum before evacuating the system?
A. 2 minutes
B. 5 minutes
C. 15 minutes
D. 1 hour
A. 2 minutes
HHFC-134a purity standards require R/R/R machines to remove which of the following contaminants from recovered refrigerant:
A . Oil
B. Moisture
C. Air
D. All of the above
D. All of the above
To properly detect a refrigerant leak with an electronic leak detector, how much refrigerant must a system contain?
A . The system must be fully charged
B. The system needs to be slightly overcharged
C. The system must be completely emptied
D. 10% to 15% still remaining in the system
D. 10% to 15% still remaining in the system