2024 International LT A/C Refrigerant & Oil Capacity

Quick Answer

• Refrigerant Type: R-134a or R-1234yf (check your specific vehicle's under-hood label for confirmation)
• Full System Charge: Varies by system. R-134a systems are typically 40-50 oz (1134-1417 grams). R-1234yf systems are typically 20-30 oz (567-850 grams). Always refer to the under-hood A/C placard.
• PAG Oil Type: PAG 46
• PAG Oil Amount: Varies by system, typically 7-10 oz (207-295 mL). Always refer to the under-hood A/C placard or service manual.
• Low-Side Service Port: Typically located on the larger-diameter aluminum line, closer to the firewall on the passenger side.
• High-Side Service Port: Typically located on the smaller-diameter aluminum line, closer to the front of the vehicle on the passenger side.

Why R-1234yf Matters

For 2024 International LT models, there's a strong likelihood your truck utilizes R-1234yf refrigerant instead of the older R-134a. This transition began around 2014 for many vehicles due to environmental concerns, as R-1234yf has a much lower Global Warming Potential (GWP) compared to R-134a. While better for the environment, R-1234yf does come with some considerations:

• Cost: R-1234yf is significantly more expensive than R-134a.
• EPA Regulations: Due to its flammability, specific EPA regulations dictate how R-1234yf must be handled, including specialized recovery and recycling equipment. Uncertified individuals should never attempt to work with R-1234yf systems.
• Recovery Machine Requirements: Shops servicing R-1234yf systems require dedicated and often more expensive recovery machines that are designed to safely handle the refrigerant. Cross-contamination between R-134a and R-1234yf systems is strictly prohibited and can damage equipment and vehicle components.

It is crucial to verify your truck's specific refrigerant type by checking the under-hood label before any service is performed.

Recharge Procedure Cautions

Recharging a 2024 International LT's A/C system is not as simple as adding a can of refrigerant from an auto parts store. Modern A/C systems, especially those using R-1234yf, are highly sensitive to proper charge amounts and require specific procedures:

1. Evacuation is Key: Before recharging, the system must be thoroughly evacuated using a vacuum pump. This removes all air and moisture, which can cause significant damage and reduce cooling performance.
2. Charge by Weight, Not Pressure: Refrigerant should always be added by weight using a calibrated charging station. Guessing by pressure can lead to over- or under-charging, both of which can cause compressor failure or poor cooling. Overcharging is a common cause of compressor damage.
3. Proper Oil Measurement: If components are replaced, the correct amount and type of PAG oil must be added. Too much or too little oil can lead to premature compressor wear.

Never mix R-134a and R-1234yf refrigerants or oils. Using the wrong type of refrigerant or oil can lead to catastrophic system failure.

Common A/C Problems for the International LT

While the 2024 International LT is a modern vehicle, some common A/C issues can arise in heavy-duty trucks:

• Compressor Failures: These can be caused by improper refrigerant charge (under or over), contaminated refrigerant, lack of lubrication, or electrical issues. Given the demanding nature of commercial trucking, compressors work hard and are susceptible to wear.
• Condenser Issues: The condenser, located at the front of the truck, is vulnerable to damage from road debris. Fins can become clogged with dirt and bugs, reducing heat exchange efficiency and leading to poor cooling.
• Evaporator Leaks: A slow leak in the evaporator core (typically located inside the cab behind the dashboard) can be difficult to detect and lead to a gradual loss of refrigerant. Signs include a musty odor or visible moisture under the dash.
• Hose and Fitting Leaks: Vibrations and extreme temperatures experienced during trucking can cause wear and tear on A/C hoses and fittings, leading to refrigerant leaks.
• Blend Door Malfunctions: While not directly a refrigerant issue, blend door actuators can fail, preventing cold air from being directed into the cab, mimicking an A/C problem.

When to Call a Pro

Given the complexity of modern A/C systems, especially those using R-1234yf, and the EPA regulations surrounding refrigerant handling, it’s always best to call a certified professional for diagnosis and repair. Attempting DIY repairs without the proper training and equipment can be costly and unsafe. An ASE-certified technician with EPA Section 609 certification is equipped to safely and effectively diagnose and repair your International LT's A/C system.

Safety Disclaimer: Working with automotive air conditioning systems involves high pressures and specialized refrigerants that can cause severe injury or environmental harm if mishandled. Always wear appropriate personal protective equipment and be EPA 609 certified when handling refrigerants. Repairius.com strongly recommends professional service for all A/C repairs.

Find a certified A/C shop on Repairius.