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AC refrigerant database

Search by make, model, year, engine or system variant such as rear evaporator / dual AC.

Data based on general technical documentation. Always verify refrigerant amount with the label under the hood.

Check refrigerant specification

Type any fragment, e.g. “Crafter rear evap”, “Audi A3 8P” or “Giulia 952”.

Search your vehicle

Enter make, model or year to see the required refrigerant and compressor oil.

3105 vehicles in database

What do the values mean?

Refrigerant type

R134a or R1234yf. Do not mix or replace without manufacturer data.

Oil type

Oil must match the compressor and refrigerant type, especially in hybrid and electric vehicles.

Amount in grams

Too little or too much refrigerant causes poor cooling and compressor risk.

FAQ

R134a or R1234yf?

The refrigerant type depends on the vehicle, model year, and market. Do not mix refrigerants and always confirm specifications via the underhood sticker or VIN.

What does 555/800 g mean?

This usually represents two system variants, e.g., standard and with a rear evaporator. The row description indicates which variant the capacity refers to.

Is the quantity alone sufficient for servicing?

No. The compressor oil type, compressor model, receiver/drier type, and the manufacturer's procedure are also critical.

Can I use standard PAG oil in the compressor of a hybrid or electric vehicle (EV)?

Absolutely not. Standard PAG oil absorbs moisture and conducts electricity. Using it in an electric compressor (e.g., in a Toyota Prius or EV) will cause high-voltage insulation failure, shut down the hybrid system, and destroy the compressor. Hybrids and EVs require dielectric POE oil ONLY (e.g., ND-11).

Can a system designed for R1234yf be filled with the older R134a gas?

Legally, it is strictly forbidden (due to homologation and emission standards). Technically, R1234yf systems operate at slightly different working pressures and use specific oils (often with additives to prevent chemical breakdown). Mixing these gases or choosing the wrong oil drastically shortens compressor life. Furthermore, service ports for R1234yf have a different diameter to prevent mistakes.

The AC system is completely empty. Can it just be refilled?

No. A complete lack of refrigerant indicates a serious leak. Refilling an empty system without first performing a leak test with nitrogen (or trace gas) will result in the new gas leaking into the atmosphere. Furthermore, in an open system, refrigerant oil absorbs moisture from the air, creating acid that quickly seizes a new compressor. Replacing the receiver-drier insert is absolutely mandatory.

Is it worth adding UV dye during every AC service?

It is not recommended to add dye blindly during every service. Excess UV dye in the system changes the viscosity of the compressor lubricating oil. In modern variable-displacement compressors, this can lead to clogging and seizure of the precise electronic control valve (ECV). Use dye only once when searching for hard-to-find leaks.

Why did the machine recover less oil than the catalog specifies? Should I fill the full amount?

Never add the "full catalog capacity" of oil during a standard service! The machine only recovers the oil currently circulating with the refrigerant (usually 5 to 20 ml). The rest (up to 80%) remains in the compressor, evaporator, and condenser. If the machine recovered 10 ml, add exactly 10 ml (+ maybe 5 ml extra). Overfilling the system with oil (oil slugging) dramatically reduces cooling efficiency and can rupture compressor valves.

How much oil remains in each AC component after replacement?

When flushing the system or replacing specific components, the oil must be compensated accordingly. Below is the estimated oil retention in each component of the system architecture:

System Component	Measured Retention	Mechanism Explanation
Compressor (A/C Compressor)	~50% of capacity	Acts as the baseline reservoir. Oil remains in the crankcase and on cylinder walls, lubricating the compression mechanisms.
Evaporator (Front)	30 ml - 45 ml	A cold evaporator and slow refrigerant flow facilitate the settling of the thickening oil film on the extensive fins.
Rear Evaporator	60 ml	In dual-zone systems (e.g., large SUVs, vans), the rear evaporator is a huge reservoir; it requires a doubled compensation dose.
Condenser (Front)	30 ml	The discharge gas under high pressure and temperature holds the oil as a fine mist. Excessive oil blocks cooling micro-channels (oil logging).
Condenser (Dual AC)	60 ml	Condensers serving dual-capacity systems have a larger internal manifold capacity.
Receiver / Drier	15 ml - 30 ml (Dual: 44-88 ml)	Due to the hygroscopic material (desiccant) and filter inserts, it permanently absorbs a specific dose of oil that cannot be drained.
Hoses & Lines	15 ml - 30 ml	Fraction settling as a wetting film on the inner teflon and aluminum walls. Always compensate for this when replacing long lines.
Rear Evaporator Suction Line	44 ml - 88 ml	In vans and 7-seater SUVs, suction hoses running the entire length of the underbody accumulate huge amounts of oil due to length and gravity drops.

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