Automotive Service Excellence (ASE) Air Conditioner Certification Practice Exam

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Which temperature should the refrigerant be at before conducting a pressure check?

45°F

65°F

The appropriate temperature for the refrigerant before conducting a pressure check is 65°F. This temperature is significant because it helps establish a baseline for accurate pressure readings in the air conditioning system. Refrigerants have specific pressure-temperature relationships known as saturation pressure and temperature; therefore, conducting pressure checks at this standard temperature allows technicians to interpret the pressure readings accurately against the manufacturer's specifications.

Reading pressures at temperatures that deviate too far from this standard could lead to misleading results, which may cause an incorrect diagnosis of the system's condition. Keeping the refrigerant at 65°F allows for a more consistent and reliable analysis of the system's performance and health.

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75°F

85°F

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