Component Function Check

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

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 (usual) pressure range. Since the standard (usual) pressure, however, differs from vehicle to vehicle, refer to Inspection (Ambient air temperature-to-operating pressure table).

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

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

High-pressure side is too low and low-pressure side is too high.

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High- and low-pressure sides become equal soon after A/C compressor operation stops.

A/C compressor pressure operation is improper.

Damaged inside A/C compressor packings.

Replace A/C compressor. Refer to Removal and Installation for A/C Compressor - VQ40DE or Removal and Installation for A/C Compressor - VK56VD .

No temperature difference between high- and low-pressure sides.

A/C compressor pressure operation is improper.

Damaged inside A/C compressor packings.

Replace A/C compressor. Refer to Removal and Installation for A/C Compressor - VQ40DE or Removal and Installation for A/C Compressor - VK56VD .