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Basic tasks involved in servicing and repairing A/C systems

• Electrical and onboard network diagnostics

• Performance testing

• System evacuation

• All of the above

A diagnostic flow chat will help to:

• enhance creativity
• improve communication skills
• identify and troubleshoot problems
• increase productivity

Less charge means not enough refrigerant can circulate to absorb and release frost.

• True

• False

Too much refrigerant can result in low cooling because the system’s pressures remain too high for the refrigeration cycle to operate effectively

• True

• False

Low pressure refrigerant switch

• prevents the vehicle from operating if a leak results in low refrigerant charge

• prevents the conductor from operating if a leak results in low refrigerant charge

• prevents the compressor from operating if a leak results in low refrigerant charge

• prevents the compressor from operating if a leak results in high refrigerant charge

A high-pressure safety switch also opens the circuit to ___________ the compressor clutch

• ground

• power

• shift

• preset

What is a performance test?

• A performance test is a type of testing that measures the compatibility of a system with different devices one by one.

• A performance test is a type of testing that measures the security vulnerabilities of a system.

• A performance test is a type of testing that measures the visual appearance of a system only.

• A performance test is a type of testing that measures the operation, responsiveness, and stability of a system under a specific workload.

The manifold gauge set valves should be both _________to prevent refrigerant from flowing to the center port of the gauge set

• open
• closed
• partially closed
• fully closed

Quick connector couplings of two different sizes ensure the _____ ____ is connected to the smaller fitting and the _____ ______ gauge to the larger low-pressure port fitting

• high-side, low-side

• medium-pressure port
• low-pressure port
• pressure relief valve

A minimum of ____ psi (6.6 kPa) refrigerant pressure at room temperature 70°F (21°C) is needed before testing can begin

• 15.0 psi

• 6.6 kPa
• 50psi

• 5.0 psi