REFRIGERANT SYSTEM INSPECTION WITH MANIFOLD GAUGE SET This is a method in which the trouble is located by using a manifold gauge set. (See "USE OF MANIFOLD GAUGE SET" on page AC–11) Read the manifold gauge pressure when the following conditions are established: (a) Temperature at the air inlet with the switch set at RECIRC is 30–35 °C (86–95 °F) (b) Engine running at 1,500 rpm (c) Blower speed control switch set at high (d) Temperature control set at max. cool HINT: It should be noted that the gauge indications may vary slightly due to ambient temperature conditions. 1. NORMALLY FUNCTIONING REFRIGERATION SYSTEM Gauge reading: Low pressure side: 0.15–0.25 MPa (1.5–2.5 kgf/cm2) High pressure side: 1.37–1.57 MPa (14–16 kgf/cm2) R134a LO HI N04147