Trouble Diagnosis For Abnormal Pressure

INSUFFICIENT COOLING

Trouble Diagnosis For Abnormal Pressure

Whenever system's high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker above the gauge scale in the following tables indicates the standard (normal) pressure range. Since the standard (normal) pressure differs from vehicle to vehicle, refer to Ambient Air Temperature-to-operating Pressure
Table above.
Both High- and Low-pressure Sides are Too High





High-pressure Side is Too High and Low-pressure Side is Too Low





High-pressure Side is Too Low and Low-pressure Side is Too High





Both High- and Low-pressure Sides are Too Low





Low-pressure Side Sometimes Becomes Negative





Low-pressure Side Becomes Negative