Correct answer: Incorrect air gap
With power and a ground, the clutch should have worked unless the gap is too wide, and is the most likely cause.
Correct answer: recover it and treat it as contaminated
If an unknown refrigerant is identified, you have to recover it and treat it as contaminated.
Correct answer: To avoid evaporator odor, you want to operate the AC in RECIRC instead of FRESH
The opposite is actually true. If you want to avoid evaporator odor, you would want to set the system to FRESH mode instead. All of the other three options are correct.
Correct answer: A missing fan shroud.
Most likely cause of the problem is a missing fan shroud.
Correct answer: Both high-side high and low-side are high
An inoperative condenser fan can cause a high high-side and high low-side reading. Answer option A is wrong because high high-side and low low-side pressure generally indicates a restriction evaporator air flow. B is wrong because high low-side and low high-side pressure indicate internal compressor damage. C is wrong because when both high and low-side pressure are low you can have the following faults: low charge, suction line obstruction, clogged orifice tube, stuck closed TXV valve and restricted line from the condenser to the evaporator.
Correct answer: An incorrect air gap
An incorrect air gap could be the cause of the problem.
Correct answer: Both technicians
Both of these techs have correct answers. When the pressure is high in both lines, it can indicate that the condenser airflow has been restricted. In addition, low pressure in both sides might indicate low refrigerant.
Correct answer: Technician X
Technician X is right. A frozen spot on a component or connection indicates a restriction in the system.
Correct answer: Clogged radiator
A clogged radiator is the most likely cause because a restriction of any kind in the cooling system will cause an engine to overheat. Answer option A is not a most likely cause because a constantly running cooling fan will not cause overheating. B is not a most likely cause because a restriction heater core will cause no heat but not necessarily cause an engine overheat. C is also wrong because a stuck open thermostat will not cause overheating.
Correct answer: X only
Technician X is right. Evacuating an A/C system will remove air and moisture from the system.
Correct answer: 475 psi (3,275 kPa)
The high-pressure relief valve keeps the pressures from reaching points where the compressor begins to lock up. This could also lead to other damage because of the high pressures. This part discharges refrigerant at about 475 psi (3,275 kPa).
Correct answer: Both technicians
Both technicians are right.
Correct answer: X only
Technician X is right because a misadjusted blend door affects heat. Technician Y is wrong because the high blower is controlled by the high blower relay not the resistor trio.
Correct answer: the low side only
To charge an A/C system while it is running, the refrigerant should be added to the low side only.
Correct answer: You must discharge the refrigeration system before the A/C control panel removal.
Any time you test, inspect, replace or service the heating and A/C control panel assemblies, you must take certain steps. First, you’ll want to disconnect the negative battery cable. Then, you also need to wait a certain time before you begin working on the panel.
Correct answer: A faulty low pressure switch.
A faulty low pressure switch could not be the cause of the problem.
Correct answer: Y only
Technician Y is right because when the system is low on coolant there is insufficient material to transfer the heat. Technician X is wrong because a stuck thermostat causes overheating resulting in high temperatures and plenty of heat.
Correct answer: Low refrigerant level
These readings indicate of a low refrigerant level.
Correct answer: Air blend door is stuck.
If the heater core was clogged, there would be no or little heat. If the cooling fan wasn’t working, the vehicle would overheat. It would also overheat with low coolant levels.
Correct answer: Technician X
Technician X is right. A clutch relay protects the control head from the clutch circuit's high current.
Correct answer: Produce higher emissions
A specific engine temperature is needed to consume all of the pollutants.
Correct answer: Both X and Y
Both technicians are right.
Correct answer: Technician X
Tech X is correct; this is a normal occurrence. If the system had an overcharge, the compressor outlet would be cold, not hot. Because of this, there’s nothing unusual to be concerned about.
Correct answer: The refrigerant changes from a vapor to a liquid as it receives heat from the cabin air.
Above statements are true, except that the refrigerant changes from a vapor to a liquid as it receives heat from the cabin air.
Correct answer: Refrigerant overcharge
When both the low and high sides are high, this indicates a refrigerant overcharge or restricted condenser. Courtesy of Toyota.
Correct answer: a broken compressor reed valve
A broken compressor reed valve could be the cause of a high side pressure in an A/C system is above the specs.
Correct answer: Reuse existing compressor oil
When you replace the AC compressor, you should always install new seals and gaskets. You can use the same or an equivalent compressor and reuse the mounting brackets. What you don’t want to do is reuse the existing compressor oil.
Correct answer: Technician Y
Technician Y is correct. It may have a faulty blower motor resistor if a blower motor operates only in high speed.
Correct answer: X only
Technician X is correct because if thermal protector fails the B+ path to the compressor clutch is open and it is the most likely cause. Technician Y is wrong because temperature door position does not affect compressor operation on a manual system.
Correct answer: 60%
The only correct answer is 60%. All refrigerant storage containers need to be filled to 60% of the gross weight rating.
