2019 International LT A/C Refrigerant & Oil Capacity

Quick Answer

• Refrigerant Type: R-134a (R-1234yf is not commonly used in this heavy-duty application)
• Full System Charge: 54 oz (1530 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: Typically 8 oz (240 mL) for a full system, but always refer to the compressor or system label for specific requirements.
• Low-Side Service Port Location: On the suction line, usually between the evaporator and the compressor, accessible under the hood.
• High-Side Service Port Location: On the discharge line, typically between the compressor and the condenser, also accessible under the hood.

Why R-1234yf Matters (and Why the LT Uses R-134a)

While the automotive industry saw a transition to R-1234yf refrigerant for new vehicles starting around 2014 due to its lower Global Warming Potential (GWP), heavy-duty trucks like the 2019 International LT often continued to use R-134a. This is primarily due to several factors:

• Cost: R-1234yf is significantly more expensive than R-134a.
• EPA Regulations: While passenger cars were phased into R-1234yf, heavy-duty vehicles had different timelines and regulations.
• Recovery Machine Requirements: R-1234yf requires specialized and more expensive recovery and charging equipment, which represents a substantial investment for fleets and service centers.

For these reasons, the 2019 International LT typically utilizes the tried-and-true R-134a, which is a reliable and widely available refrigerant for this application.

Recharge Procedure: Get it Right by Weight!

Recharging your A/C system isn't as simple as just adding a can of refrigerant until it feels cold. Proper procedure is critical for system longevity and performance. Always evacuate the system and charge by weight, not by pressure.

1. Evacuate the System: A vacuum pump is used to remove all air and moisture from the A/C system. This is a crucial step as moisture can combine with refrigerant to form corrosive acids, leading to component failure.
2. Verify No Leaks: After evacuation, the system should hold a vacuum for a specified period, indicating no leaks. If it doesn't, a leak detection process must be performed.
3. Add PAG Oil (if necessary): If components were replaced or the system was fully discharged, the appropriate amount of PAG 46 oil needs to be added. Consult your vehicle's service manual or component specifications for precise amounts.
4. Charge with R-134a by Weight: Using a refrigerant charging station, the correct amount of R-134a (54 oz or 1530 grams for the 2019 International LT) is charged into the system. Never guess or rely solely on pressure gauges for charging; weight is king! Overcharging or undercharging can both lead to poor performance and damage to expensive components like the compressor.
5. Performance Test: Once charged, the system should be tested for proper operation, including vent temperatures and system pressures.

Common A/C Problems for the 2019 International LT

Heavy-duty truck A/C systems work hard and can experience specific issues:

• Compressor Failures: The compressor is the heart of the A/C system, and due to continuous operation, especially in harsh conditions, it can wear out. Lack of lubrication (often due to refrigerant leaks and subsequent oil loss) or slugging from overcharging can also cause premature failure.
• Condenser Issues: The condenser, usually located in front of the radiator, can become clogged with debris (dirt, bugs, road grime), impeding heat transfer and leading to high head pressures, reduced cooling, and compressor strain. Physical damage from road hazards is also common.
• Evaporator Leaks: The evaporator, located inside the cab, can develop leaks over time due to corrosion or vibration. These leaks are often slow and can be difficult to pinpoint, leading to gradual refrigerant loss and weakened cooling.
• Blend Door/Actuator Problems: While not directly a refrigerant issue, blend door failures can prevent proper temperature control even with a fully charged system. This can manifest as only hot or only cold air, regardless of setting.

When to Call a Pro

Working with automotive air conditioning systems requires specialized knowledge, tools, and safety precautions. Refrigerants are hazardous, and improper handling can lead to personal injury or environmental damage. Only attempt A/C service if you are EPA 609 certified and have the proper equipment.

If your 2019 International LT's A/C isn't blowing cold, is making unusual noises, or you suspect a leak, it's always best to consult a certified HVAC professional. They have the expertise and equipment to:

• Accurately diagnose the problem.
• Safely recover and recycle refrigerant.
• Perform repairs correctly.
• Charge the system to exact specifications.

Find a certified A/C shop on Repairius.