2019 Nissan Altima A/C Refrigerant and Oil Capacity

Quick answer

• Refrigerant Type: R-1234yf
• Full System Charge: 14.11 oz (400 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 4.41 oz (130 mL)
• Low-Side Service Port Location: On the suction line, typically near the firewall on the passenger side.
• High-Side Service Port Location: On the discharge line, typically near the condenser at the front of the vehicle.

Why R-1234yf matters

The 2019 Nissan Altima uses R-1234yf refrigerant, a standard for most new vehicles since around 2014. This transition from the older R-134a wasn't just a whim; it was a global effort to reduce the automotive industry's environmental impact. R-1234yf has a significantly lower Global Warming Potential (GWP) compared to R-134a, making it much more environmentally friendly.

However, this change comes with implications. R-1234yf is considerably more expensive than R-134a, and its handling requires specialized equipment. Shops performing R-1234yf service must invest in dedicated recovery and recharge machines. This means that attempting a DIY recharge with over-the-counter kits designed for R-134a is not only ineffective but also potentially damaging and illegal. Never mix refrigerant types or try to "convert" a system without professional guidance.

Recharge procedure

Recharging your 2019 Nissan Altima's A/C system is not as simple as just adding a can of refrigerant. It's a precise process best left to certified professionals. A proper recharge involves:

1. Recovery: The old refrigerant (and any contaminants) is safely removed from the system.
2. Evacuation: A vacuum pump removes all air and moisture from the system. This step is critical, as moisture can combine with refrigerant to form corrosive acids, leading to premature component failure.
3. Leak Detection: Before recharging, a thorough leak check should be performed to ensure there are no breaches in the system. Adding refrigerant to a leaking system is a waste of money and harmful to the environment.
4. Recharge by Weight: The correct amount of R-1234yf, as specified by Nissan (14.11 oz or 400 grams for the 2019 Altima), is precisely measured and added to the system using specialized equipment. Never charge by pressure alone, as this can lead to over or undercharging, both of which can damage the compressor and reduce cooling efficiency.

While some pressure gauges are sold for DIY use, they don't provide the full picture. The correct charge weight is paramount for optimal performance and compressor longevity.

Common A/C problems for this vehicle

Even with a well-maintained system, certain components can fail over time. For the 2019 Nissan Altima, common A/C issues can include:

• Compressor Failures: The compressor is the heart of the A/C system, circulating the refrigerant. Issues can include internal wear, clutch problems, or electrical failures. A failing compressor might produce grinding noises, intermittent cooling, or no cooling at all.
• Condenser Issues: Located at the front of the vehicle, the condenser dissipates heat from the refrigerant. It