In brief, the 2018 Jeep Grand Cherokee uses R-134a refrigerant (also called HFC-134a) for its air conditioning system.
Beyond the basic answer, the 2018 Grand Cherokee’s A/C is designed around a sealed R-134a circuit that uses PAG oil, requires proper evacuation and charging by a trained technician, and should not be mixed with other refrigerants. Understanding the refrigerant type helps with maintenance, service procedures, and safety.
Refrigerant type and essential details
The 2018 Grand Cherokee uses R-134a refrigerant as the standard for its air conditioning system. This type of refrigerant is common in many vehicles built before about 2020 and requires specific oil—typically PAG oil (often PAG-46)—in the system. Using the wrong refrigerant or oil can damage seals, compressor, and overall performance.
R-134a stands for tetrafluoroethane, a hydrofluorocarbon refrigerant that does not deplete the ozone layer but has a high global warming potential. It is important to service the system using the correct refrigerant and oil as outlined by the vehicle’s service manual or a certified technician.
Refrigerant fundamentals for this model year:
- R-134a is the standard refrigerant for the 2018 Grand Cherokee. Do not substitute R-1234yf or other refrigerants unless explicitly instructed by a service manual.
- PAG oil is used with R-134a systems; the common grade is PAG-46, but always confirm the exact specification from the manual or the A/C service label.
- Do not mix refrigerants. If the system contains a different refrigerant or if you’re unsure, have the system evacuated by a qualified technician before charging.
- The exact refrigerant charge varies by HVAC configuration and vehicle trim; rely on the service manual or dealer specification for the precise amount.
- If the A/C isn’t cooling properly, address leaks and perform a professional leak check before attempting a charge.
In practice, these guidelines help ensure that service crews use the correct refrigerant and oil and that the system is properly evacuated, leak-checked, and charged to the manufacturer’s specifications.
Service considerations and safety
Working with automotive refrigerants requires proper training and equipment. R-134a is a non-ozone-depleting refrigerant, but it has environmental and safety considerations, including proper recovery and disposal. Refrigerant handling should comply with EPA regulations and local environmental rules. If you’re unsure about the type or charge, consult your owner’s manual or a certified A/C technician.
Before any service, here are key points to communicate to a shop:
- Confirm the vehicle year and model (2018 Jeep Grand Cherokee) to ensure the correct refrigerant type.
- State that the system uses R-134a and requires PAG oil (often PAG-46) if oil replacement is involved.
- Request a full leak check, vacuum evacuation to a deep level (typically below 500 microns), and a proper recharge with the correct charge amount.
- Avoid switching to R-1234yf or other refrigerants unless the technical service manual explicitly allows it for your configuration.
- Use appropriate recovery/charging equipment and verify all seals, hoses, and connections.
The goal is a properly charged system with no leaks, using the correct refrigerant and oil, to ensure reliable cooling performance and system longevity.
Summary
For a 2018 Jeep Grand Cherokee, the recommended refrigerant is R-134a with PAG oil. Ensure proper service by following the vehicle’s manual, and have a qualified technician perform evacuation, leak checks, and a correct recharge if needed. Avoid mixing refrigerants or attempting DIY charges without appropriate equipment and training.