A/C Pressure Switch

WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

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 a signal to the PCM and the A/C compressor stops operating.

Fig 1: Identifying High-Low Pressure Switch Dimensions
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Middle pressure switch
If the refrigerant pressure goes above or below 1,520 kPa (15.5 kgf/cm² , 220 psi), the A/C pressure switch opens or closes to signal the PCM to change the speed of the A/C condenser fan and radiator fan (high-low).

Fig 2: Identifying Middle Pressure Switch Dimensions
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Identifying Climate Control Door Positions (1 Of 2)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 4: Identifying Climate Control Door Positions (2 Of 2)

Courtesy of AMERICAN HONDA MOTOR CO., INC.