Nissan Altima Refrigeration System

Refrigerant Basics

Usually, the refrigerant used in automotive air conditioning systems, including those in your Altima, is the R-134a refrigerant. However, it’s always a good practice to check your owner’s manual for specific recommendations.

Measuring Refrigerant Pressure

Using a Refrigeration Pressure Gauge

To ensure your air conditioner is functioning optimally, it’s essential to measure the refrigerant pressure. This requires a specialized refrigeration pressure gauge. When using the R-134a refrigerant, adhere to the pressure levels outlined in the manufacturer’s specifications.

Professional Assistance

To perform this measurement accurately, it’s advisable to have a professional handle the task. Pressure levels must be checked while the engine is running and the air conditioner is turned on.

Addressing Low or High Pressure

If the pressure levels in your Altima’s air conditioning system deviate from the specified range, a recharge of the refrigerant might be necessary to restore optimal performance.

Refrigerant Amount for Your Altima

System-specific Quantities

The amount of refrigerant required for your Altima’s air conditioning system can vary. Typically, it ranges from 1 to 1.5 pounds. For precise information, refer to your Altima’s owner’s manual.

Understanding the Refrigeration System

Refrigerant Cycle

The refrigerant flows through the compressor, condenser with a liquid tank, evaporator, and back to the compressor in a standard pattern. An externally equalized expansion valve in the evaporator case controls the refrigerant’s evaporation through the evaporator coil.

System Protections

Refrigerant Pressure Sensor

Your Altima’s refrigeration system includes a refrigerant pressure sensor located on the condenser. This sensor protects against excessively high or low pressures. If the pressure deviates from specifications, the sensor sends a signal to the ECM, which disengages the compressor to prevent damage.

Pressure Relief Valve

A pressure relief valve, situated in the rear head of the compressor, provides additional protection. If the refrigerant pressure rises to an abnormal level, the valve automatically releases refrigerant into the atmosphere.

OEM Radiator for Nissan Altima


In addition to maintaining your Altima’s air conditioning system, it’s essential to consider the radiator’s condition. The radiator assembly, such as the Nissan 21410-ZN50B, plays a crucial role in engine cooling.

Radiator Specifications

  • Brand: Parts
  • SKU: 21410-ZN50B
  • Condition: New
  • Applications: 2.5L, 3.5L
  • Replaces: 21410-JA00A, 21410-ZN50A
  • Sold In Quantity: 1

Vehicle Fitment

Ensure compatibility by checking your Altima’s make, model, body, trim, engine, and transmission details. The 21410-ZN50B radiator fits various Altima models, including the 2018, 2017, 2016, 2012, and 2011 models.

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