A/C Pressure Switch: Notes

The A/C pressure switch consists of a high-low pressure switch (A/C pressure switch A) and a middle pressure switch (A/C pressure switch B).

• High-low pressure switch

  If the refrigerant pressure becomes too high (due to blockage or lack of airflow at the A/C condenser), or too low (due to leakage), the A/C pressure switch stops the A/C request signal to the ECM/PCM and the A/C compressor stops operating.

  Fig 1: Identifying A/C Pressure Switch

  Courtesy of AMERICAN HONDA MOTOR CO., INC.
• Middle pressure switch

  If the refrigerant pressure goes above 1,470 kPa (15.0 kgf/cm² , 213 psi), the A/C pressure switch closes to signal the ECM/PCM to change the speed of the A/C condenser fan and radiator fan to high when the refrigerant pressure drops below 1,075 kPa (10.1 kgf/cm² , 156 psi), the A/C pressure switch opens to signal the ECM/PCM to change the speed of the A/C condenser fan and radiator fan to low.

  Fig 2: Identifying Middle Pressure Switch (1 Of 3)

  Courtesy of AMERICAN HONDA MOTOR CO., INC.
  Fig 3: Identifying Middle Pressure Switch (2 Of 3)

  Courtesy of AMERICAN HONDA MOTOR CO., INC.
  Fig 4: Identifying Middle Pressure Switch (3 Of 3)

  Courtesy of AMERICAN HONDA MOTOR CO., INC.