2019 Honda Civic A/C Refrigerant & Oil Capacity

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 14.1-15.9 oz (400-450 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 4.4-5.1 oz (130-150 mL)
• Low-Side Service Port Location: On the refrigerant line near the firewall, typically on the passenger side.
• High-Side Service Port Location: On the refrigerant line closer to the condenser, usually on the driver's side.

The 2019 Honda Civic, like many vehicles manufactured after 2014, uses R-1234yf refrigerant. This was a significant transition from the older R-134a refrigerant due to environmental regulations. Always refer to the underhood label for the precise charge capacity for your specific Civic trim.

Why R-1234yf Matters

R-1234yf is a hydrofluoroolefin (HFO) refrigerant designed to have a much lower Global Warming Potential (GWP) compared to R-134a. While better for the environment, there are a few key considerations for vehicle owners and technicians:

• Cost: R-1234yf is generally more expensive than R-134a, which can translate to higher repair costs when an A/C recharge is needed.
• EPA Regulations: The transition to R-1234yf is a direct result of EPA regulations aimed at reducing the environmental impact of refrigerants. This means that older R-134a systems cannot simply be retrofitted with R-1234yf, and vice-versa, due to different pressures and lubrication requirements.
• Recovery Machine Requirements: Due to its flammability characteristics (though mild), specialized recovery, recycling, and recharging (RRR) equipment is required for R-1234yf. This equipment is often more expensive and sophisticated than that used for R-134a, limiting its availability to properly equipped shops.

Recharge Procedure

Recharging your 2019 Honda Civic's A/C system should primarily be done by weight, not by pressure, using a dedicated A/C service machine. Here's a high-level overview, but always consult a professional:

1. Evacuation: The system must first be evacuated using a vacuum pump to remove all air and moisture. Moisture in an A/C system can lead to acidic contamination and component failure.
2. Leak Detection: Before recharging, ensure there are no leaks in the system. A professional will use specialized leak detection equipment.
3. Proper Charge by Weight: Using an A/C machine, the exact amount of refrigerant (as specified on your underhood label or in service information) is charged into the system by weight. Overcharging or undercharging can both lead to poor cooling performance and potential compressor damage. Do not rely solely on pressure readings.

Common A/C Problems for the 2019 Honda Civic

While the 2019 Honda Civic generally has a reliable A/C system, some common issues can arise:

• Compressor Failures: The A/C compressor is the heart of the system. Failures can be due to inadequate lubrication (low oil), contamination, or internal mechanical issues. Symptoms include a loud grinding noise, clutch not engaging, or no cold air.
• Condenser Issues: The condenser, located in front of the radiator, is susceptible to damage from road debris. A damaged or clogged condenser can hinder heat transfer, leading to poor cooling.
• Evaporator Leaks: The evaporator, located inside the dashboard, can develop leaks over time. These are often difficult to diagnose without specialized tools and can lead to a musty smell from the vents before complete failure.

When to Call a Pro

Due to the specialized equipment and knowledge required for R-1234yf systems, it's highly recommended to call a professional HVAC technician when:

• Your A/C system is not blowing cold air.
• You hear unusual noises from the A/C system.
• You suspect a refrigerant leak.
• You need an A/C system diagnosis or recharge.

Safety Disclaimer: Working with refrigerants requires specialized training and equipment. Refrigerants can cause frostbite and other injuries if not handled properly. Improper handling can also lead to environmental harm. It is illegal to intentionally vent refrigerants into the atmosphere. Always ensure any A/C work is performed by an EPA 609 certified technician.

Find a certified A/C shop on Repairius.