2023 Ford F-350 Super Duty — A/C Refrigerant Capacity & PAG Oil Specs

Quick answer

• Refrigerant: R-1234yf (factory fill)
• System charge (most common): 28–32 oz (800–900 g). Exact value varies by engine/trim; always confirm on the under‑hood A/C label.
• PAG oil: PAG 46 (Motorcraft R-1234yf compressor oil, e.g., YN-35), total system oil typically 6.8–7.4 oz (200–220 mL). Add amounts per component when replacing parts per Ford WSM.
• Service ports:
  • Low side: On the larger-diameter suction line near the accumulator/evaporator outlet at the passenger-side firewall (engine bay).
  • High side: On the smaller-diameter liquid/discharge line near the condenser at the front, typically passenger side radiator support.

Note: Never mix refrigerants. Verify the exact charge on the vehicle’s under‑hood decal and in Ford’s Workshop Manual (WSM) for your specific engine and HVAC configuration.

Why R-1234yf matters

• Regulatory: By 2023, Ford Super Duty trucks ship with R-1234yf to meet EPA/SNAP and global greenhouse gas requirements. R-1234yf has a very low GWP compared to R‑134a.
• Cost and service: R-1234yf is significantly more expensive than R‑134a and requires dedicated recovery/recycle/recharge (RRR) machines rated for A2L (mildly flammable) refrigerants. Shops need SAE J2843 equipment and separate fittings—do not cross-use R‑134a tools.
• Safety and legality: It’s illegal to vent refrigerant. Recovering and charging R‑1234yf must be performed with proper equipment by technicians certified under EPA Section 609. Mixing R‑134a and R‑1234yf or using blends will contaminate the system and service equipment, creating safety and legal issues.

Recharge procedure (high‑level)

1. Confirm specs: Read the under‑hood A/C label for the exact R‑1234yf charge mass and oil spec for your truck’s configuration (engine, cab, and condenser style can affect fill).
2. Leak check: If the system is low, find and fix leaks first. UV dye (from prior service) and an electronic leak detector appropriate for R‑1234yf help locate common leaks at condenser, hose crimps, and service ports.
3. Recover any remaining refrigerant with an R‑1234yf RRR machine. Do not vent.
4. Open and replace components (if needed). Cap lines to prevent moisture ingress. Replace all disturbed O‑rings with correct green HNBR sizes lubricated with PAG 46.
5. Evacuate: Pull vacuum to at least 28–29 inHg for 30–45 minutes. Close valves and perform a vacuum decay test (5–10 minutes). A stable vacuum indicates no gross leaks and adequate dehydration.
6. Charge by weight: Charge the exact mass of R‑1234yf shown on the label, using the machine’s scale. Do not “charge to pressure.” Ambient temperature, fan speed, and engine load make pressure readings unreliable for determining charge accuracy.
7. Verify operation: With the engine at 1,500 rpm, A/C on MAX, blower high, doors open, verify center vent temperature and line temperatures. Compare high/low pressures to a performance chart for the current ambient conditions. Inspect condenser fan/clutch operation.

Oil note: When replacing parts, add oil by component per Ford WSM 412-00. Typical add-back amounts: compressor ~1.4–2.0 oz (40–60 mL), condenser ~1.0 oz (30 mL), evaporator ~2.0 oz (60 mL), accumulator/receiver ~1.0 oz (30 mL). Total system typically 6.8–7.4 oz (200–220 mL), but do not overfill—match what was drained plus component add-backs.

Common A/C problems for this vehicle

• Condenser damage/leaks: The front-mounted condenser on Super Duty trucks is vulnerable to road debris and fin corrosion. Pinholes at tube-to-header joints and stone strikes are common leak points.
• Compressor control issues: The clutchless, variable-displacement compressor can suffer from control valve sticking or contamination from desiccant breakdown, leading to warm air at idle or cycling complaints.
• Refrigerant loss at hose crimps and service ports: O‑ring flattening and crimp seepage can cause gradual performance decline over months.
• Evaporator core leaks: Less common but possible; look for oily residue in the HVAC case and persistent dye traces at the condensate drain.
• Cooling fan/airflow faults: On diesels especially, inadequate condenser airflow (fan clutch, shutters, or debris-packed fins) raises high-side pressure and hurts cabin cooling when towing or idling.
• Blend/recirc door actuators: If temperatures are inconsistent left-to-right or won’t hold a set temperature, an actuator or door foam issue may be at play (electrical fault codes stored in the HVAC module help confirm).

OEM service info

• Verify charge and oil specs on the under‑hood A/C label and in Ford’s Workshop Manual (WSM), Section 412 (Climate Control).
• Use Motorcraft R‑1234yf refrigerant and Motorcraft R‑1234yf compressor oil (PAG 46). Replace the receiver/drier anytime the system is open to atmosphere.
• Torque fasteners and line fittings to WSM specs, and use new sealing washers/O‑rings as specified.

When to call a pro

• You don’t have an R‑1234yf machine capable of recovery, deep vacuum, and charge-by-weight.
• The system is empty or repeatedly leaks down—professional leak detection and evacuation are required.
• Electrical or control issues with the variable compressor, pressure transducer, or blend doors require scan tool data and HVAC self-tests.

Safety disclaimer: Servicing mobile A/C systems with R‑1234yf requires EPA Section 609 certification and compliant equipment. R‑1234yf is mildly flammable (A2L). Always recover refrigerant, evacuate thoroughly, and charge strictly by weight per the under‑hood label.

Find a certified A/C shop on Repairius.