2019 Honda Pilot: A/C Refrigerant & Oil Specifications

Quick Answer

• Refrigerant Type: HFO-1234yf (R-1234yf)
• System Charge Amount: 21.9 oz (620g)
• PAG Oil Type: PAG 46
• PAG Oil Capacity: 4.1 oz (120mL)
• Low-Side Port: Near the firewall, on the passenger side
• High-Side Port: In front of the radiator, on the driver side of the condenser

Why R-1234yf Matters

Starting in 2014, Honda, along with most other automakers, began transitioning from R-134a to the more environmentally friendly R-1234yf refrigerant. If you're a DIYer used to servicing your own A/C, it's critical to understand that R-1234yf is not a "drop-in" replacement for R-134a, and the two refrigerants cannot be mixed. R-1234yf systems operate at similar pressures to R-134a systems, but have unique service ports to prevent cross-contamination. R-1234yf is also significantly more expensive than R-134a and is mildly flammable, so it requires special, UL-listed recovery and charging equipment.

Recharge Procedure

A proper A/C service is not as simple as topping off the system with a can of refrigerant from the auto parts store. To ensure optimal performance and longevity of your A/C system, it's crucial to follow the correct procedure:

1. Evacuate the system: An A/C machine is used to pull a deep vacuum on the system for at least 30 minutes. This removes all of the old refrigerant and, more importantly, any moisture that may have entered the system. Moisture is the enemy of A/C systems, as it can mix with refrigerant and oil to form corrosive acids.
2. Charge by weight: Once the system has been evacuated, the correct amount of refrigerant is weighed and added to the system. Attempting to charge the system based on pressure readings alone is inaccurate and can lead to over- or under-charging, both of which can damage the A/C compressor.

Common A/C Problems for This Vehicle

While the third-generation Honda Pilot is generally reliable, there are a few common A/C issues to be aware of:

• Compressor failure: The A/C compressor is the heart of the system, and it's not uncommon for it to fail. Symptoms of a failing compressor include a grinding noise when the A/C is turned on, a lack of cold air, and a tripped circuit breaker.
• Condenser issues: The condenser, located in front of the radiator, is susceptible to damage from road debris. A clogged or damaged condenser will prevent the refrigerant from properly cooling, resulting in poor A/C performance. It's important to regularly inspect the condenser and clean it of any dirt or debris.
• Evaporator leaks: The evaporator is located inside the dashboard and is responsible for cooling the air that blows into the cabin. A leak in the evaporator can be difficult to diagnose, but common symptoms include a musty smell coming from the vents and a loss of cooling performance over time.

When to Call a Pro

While some basic A/C maintenance, like cleaning the condenser, can be performed by a DIYer, most A/C repairs should be left to a professional. This is especially true for systems with R-1234yf, which require special equipment and training. If you're experiencing any A/C problems with your Honda Pilot, it's best to take it to a qualified technician for diagnosis and repair.

Disclaimer: The information in this article is for informational purposes only. A/C systems are under high pressure and can be dangerous to work on without proper training and equipment. Always wear safety glasses and gloves when working on your A/C system, and be sure to follow all manufacturer's service procedures. It is illegal to release refrigerant into the atmosphere. You must be EPA 609 certified to service automotive A/C systems.

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