An A/C System Operation check is primarily used to:

• A. Assess performance of engine cooling
• B. Check refrigerant pressures to ensure proper operation
• C. Measure air quality inside cabin
• D. Inspect battery health

Answer: (B)

An A/C System Operation check centers on verifying that the refrigerant is charged correctly and the system is running within the designed pressure ranges. Reading the low-side and high-side pressures while the compressor is operating shows whether the charge is right, if there’s a leak, or if a component isn’t functioning properly. These pressure readings tie directly to cooling performance because proper pressures allow the condenser and evaporator to exchange heat effectively. The other options don’t fit because engine cooling concerns the engine’s cooling system, cabin air quality is about filtration and ventilation rather than refrigerant pressures, and battery health deals with electrical systems outside the A/C refrigerant loop.