2019 Isuzu NPR A/C Refrigerant & Oil Specifications

Quick Answer

• Refrigerant Type: R-134a
• System Charge: 26.5 oz (750g)
• PAG Oil Type: PAG 46
• PAG Oil Capacity: 5.1 oz (150mL)
• Low-Side Port: Near the firewall, on the passenger side of the vehicle
• High-Side Port: In front of the radiator, behind the front grille

Why R-1234yf Matters

While many vehicles manufactured after 2014 have transitioned to the more environmentally friendly R-1234yf refrigerant, the 2019 Isuzu NPR still uses R-134a. This is good news for DIYers and independent shops, as R-134a is less expensive and doesn't require a dedicated, R-1234yf-specific recovery machine. However, it's still important to be aware of the difference and to always use the correct refrigerant for your vehicle.

Recharge Procedure

A proper A/C recharge is not a simple "top-off." To ensure proper cooling and system longevity, the system must be fully evacuated of all refrigerant and moisture before being recharged with the precise weight of refrigerant specified by the manufacturer. Recharging by pressure can lead to an undercharged or overcharged system, both of which can cause damage to the compressor and other components. Always use a manifold gauge set and a vacuum pump, and charge the system with a digital scale to ensure accuracy.

Common A/C Problems for This Vehicle

Isuzu NPRs of this generation are known for a few common A/C issues:

• Compressor Failures: The compressor is the heart of the A/C system, and it can fail due to a variety of factors, including low refrigerant, improper lubrication, or simply age. A failed compressor will often make a grinding or squealing noise when the A/C is turned on.
• Condenser Issues: The condenser is located in front of the radiator and is responsible for dissipating heat from the refrigerant. It can be damaged by road debris, or it can become clogged with dirt and bugs, which will reduce its efficiency and cause the A/C to blow warm.
• Evaporator Leaks: The evaporator is located inside the dashboard and is responsible for cooling the air that blows into the cabin. It can develop leaks over time, which will cause the refrigerant to escape and the A/C to stop working.

When to Call a Pro

While a confident DIYer can perform an A/C recharge, it's important to know when to call a professional. If you're not comfortable with the procedure, or if you don't have the proper equipment, it's best to leave it to a certified technician. Additionally, if you suspect a leak or other more complex issue, a professional will have the tools and expertise to diagnose and repair the problem correctly.

Disclaimer: The EPA requires that anyone who services, repairs, or disposes of motor vehicle air conditioning systems be certified in refrigerant recovery and recycling. For more information, please visit the EPA's website.

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