2020 Jeep Gladiator — A/C Refrigerant Capacity & PAG Oil Specs

Quick answer

• Refrigerant: R-1234yf (most 2020 Jeep Gladiator models use R-1234yf; FCA transitioned mid-2010s). Always confirm on the under‑hood A/C label.
• Full system charge: Typically around 500–600 g (17.6–21.2 oz). Exact charge varies by trim/option package—verify the label or OEM service info for your VIN.
• PAG oil: Usually PAG 46 for R-1234yf systems. Total system oil is commonly ~120 mL (about 4.0 oz), but the add-back amount depends on the component replaced. Check Mopar service procedures.
• Service port locations:
  • Low-side: On the larger-diameter aluminum suction line near the firewall on the passenger side (close to the evaporator/expansion valve area).
  • High-side: On the smaller-diameter liquid line near the condenser/front passenger side of the engine bay (near the radiator support).

Why R-1234yf matters

• Cost and availability: R-1234yf is significantly more expensive than R-134a, and cans/adapters are different to prevent mixing. Budget accordingly if you need a recharge or leak repair.
• Environmental compliance: R-1234yf has a much lower global warming potential than R-134a. 2014+ vehicles were phased to yf for EPA compliance. It is illegal to retrofit a 2014+ yf system to R-134a in the U.S.
• Equipment requirements: Recover/recycle/recharge must be performed with an SAE J2843-certified R-1234yf machine and dedicated hoses/fittings. Do not use R-134a equipment on yf systems.
• Safety: R-1234yf is an A2L mildly flammable refrigerant. Follow OEM and SAE procedures, keep ignition sources away, and use proper ventilation and eye/hand protection.

Recharge procedure (high level)

• Confirm the exact charge: Read the under-hood label for the precise R-1234yf charge (grams/ounces) and the PAG oil type. The label takes precedence over any general guide.
• Leak check first: Never “top off” a modern system. If cooling is weak or the clutch won’t engage, check for leaks. Use an electronic leak detector and/or nitrogen pressure test with trace dye per OEM procedures.
• Recover and evacuate: Use an R-1234yf machine to recover any remaining refrigerant. Pull a deep vacuum (approximately 30 inHg) and verify it holds—typically 15–30 minutes hold after a 30–45 minute evacuation, per your machine/OEM guidance.
• Charge by weight, not pressure: With the engine off and system empty, charge the exact specified weight using a calibrated scale on a yf machine. Do not charge by pressure or can feel—incorrect charge can cause poor cooling and compressor damage.
• Oil handling: Only add PAG oil if components were replaced or oil was recovered. Use the OEM-specified viscosity (commonly PAG 46 for Gladiator yf systems) and the service manual’s add-back amounts for each component (compressor, condenser, evaporator, lines).
• Post-checks: After charging, verify clutch/compressor control valve operation, condenser fan operation, and outlet temps. Compare high/low pressures to OEM diagnostic charts at a known ambient temperature.

Common A/C problems for this vehicle

• Condenser leaks: FCA/Jeep trucks and SUVs of this era are known for condenser seam leaks or stone damage at the front. A small leak will gradually reduce cooling; UV dye often shows at the lower corners of the condenser.
• Line rub-through and O-rings: Hard lines can chafe near brackets, and quick-connect O-rings may seep. Inspect along the passenger-side frame rail and near the radiator support.
• Compressor control valve issues: Poor cooling at idle or vent temps that cycle hot/cold can point to a sticking control valve or internal compressor wear. Correct refrigerant charge is critical before condemning the compressor.
• Expansion valve/evaporator concerns: An erratic expansion valve can cause fluctuating pressures. Evaporator core leaks are less common but possible—look for dye at the condensate drain or use an electronic sniffer at the dash drain.
• HVAC actuators and sensors: Blend door actuator faults or a skewed cabin temp sensor can mimic A/C failures. Use scan data (wiTECH) to confirm actuator positions and HVAC module DTCs.

OEM service info you should know

• The exact refrigerant and oil specs are on the Mopar under-hood label and in the Jeep Gladiator service manual. Always follow those values for your VIN/trim.
• FCA/Jeep diagnostic routines (wiTECH) include HVAC module tests, actuator recalibration, and compressor command monitoring. Software updates may resolve engagement or control complaints.
• Technical Service Bulletins (TSBs) for this generation have addressed A/C performance and leak concerns (e.g., condenser and line routing). Check for applicable TSBs and warranty extensions by VIN.

When to call a pro

• The system won’t hold vacuum, the compressor won’t engage after a correct charge, or you suspect a leak at the condenser/evaporator.
• You don’t have an R-1234yf recovery machine or EPA Section 609 certification.
• Repeated performance issues after DIY charging attempts—over/undercharge can damage the compressor and reduce condenser efficiency.

Safety disclaimer: Refrigerant recovery, recycling, and recharging must be performed by an EPA Section 609–certified technician using proper R-1234yf equipment. Venting refrigerant is illegal. Follow all OEM and SAE procedures, wear PPE, and verify the exact charge from the vehicle label.

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