A/C Pressure Switch

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 and the signal to the ECM and the A/C compressor stops operating.

  Fig 1: Identifying High-Low 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 to change the speed of the A/C condenser fan and radiator fan (high). When the pressure drops to 1,080 kPa (11.0 kgf/cm² , 156 psi) the switch opens and funs return to low speed.

  Fig 2: Identifying Middle Pressure Switch

  Courtesy of AMERICAN HONDA MOTOR CO., INC.