A/C Refrigerant (Dual) Pressure Switch Inspection for H25 Engine Model

Check dual pressure switch (1) on liquid pipe (3) 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 these cases, switches should show proper continuity.

Fig 1: Checking 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
1. Switch ON: Above "C" and below "D"
2. Switch OFF: Below "A" or above "B"
3. "A": Approx. 200 kPa (2.0 kg/cm² )
4. "B": Approx. 3200 kPa (32 kg/cm² )
5. "C": Approx. 23 kPa (2.3 kg/cm² )
6. "D": Approx. 2800 kPa (28 kg/cm² )
Tightening torque
1. Dual pressure switch: 10 N.m (1.0 kg-m, 7.5 lb-ft)
Fig 2: Checking Switch For Operation
Courtesy of SUZUKI OF AMERICA CORP.