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 condenser), or too low (due to leakage), the A/C pressure switch stops the A/C request signal to the PCM and the A/C compressor stops operating.

  Fig 1: Identifying High-Low Pressure Switch Diagram

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

  If the refrigerant pressure goes above 1,520 kPa (15.5 kgf/cm² , 221 psi), the A/C pressure switch closes to signal the PCM to change the speed of the A/C condenser fan and radiator fan to high. When the refrigerant pressure drops below 1,230 kPa (12.5 kgf/cm² , 178 psi), the A/C pressure switch opens to signal the PCM to change the speed of the A/C condenser fan and radiator fan to low.

Fig 2: Identifying Middle Pressure Switch Diagram

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Identifying Vent Mode Direction (1 Of 2)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 4: Identifying Vent Mode Direction (2 Of 2)

Courtesy of AMERICAN HONDA MOTOR CO., INC.