Dual (Refrigerant) Pressure Switch Inspection

WARNING: This page is about a different car, the 2004 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.

Check dual pressure switch (1) on liquid pipe for continuity at normal temperature (approx. 25°C, 77°F) when A/C system has a proper charge of refrigerant and when A/C system (compressor) is under operation. In each of these cases, switches should show proper continuity.

Fig 1: Identifying Dual Pressure Switch
Courtesy of SUZUKI OF AMERICA CORP.
Using a manifold gauge set, check switch for operation specified pressure as shown, refer to "PERFORMANCE DIAGNOSIS OF A/C SYSTEM: ".

Dual pressure switch specification

Switch ON: above "C" and below "D"

Switch OFF: below "A" or above "B"

"A": Approx. 200 KPa (2.0 kg/cm ² )

"B": Approx. 3200 kPa (32 kg/cm ² )

"C": Approx. 23 kPa (2.3 kg/cm ² )

"D": Approx. 2800 kPa (28 kg/cm ² )

Tightening torque

Dual pressure switch: 10 N.m (1.0 kg-m, 7.5 lb-ft)

Fig 2: Dual Pressure Switch Continuity Graph

Courtesy of SUZUKI OF AMERICA CORP.