R744 CO2 Multi-Fit AC Compressor 30DB | 12V Low Noise

How we label data. Confirmed values are read from supplied stock and published technical data; reference values are published cross references and are shown for identification only; anything not published is withheld rather than guessed.

An air-conditioning compressor pressurises refrigerant vapour and drives it around the loop. What changes with R744 refrigerant is the pressure: R744 is carbon dioxide, and a CO2 loop runs transcritical at roughly ten times the working pressure of an R134a system — published industry data gives a saturation pressure of about 6370 kPa gauge at 25 degrees C for R744 against roughly 567 kPa gauge for R134a. That is why a CO2 loop needs its own compressor, oil, hose ratings and service equipment.

The 30DB R744 AC compressor offered here is a multi-fit aftermarket unit, sold by specification rather than by one vehicle part number. The 30DB label belongs to the low-noise class naming used for this universal family, and the listing cites Toyota, Honda, Nissan, Mazda, Suzuki, Hyundai, Kia and Ford applications. Those names are the applications the seller cites; they are not a claim that this unit is a genuine OE part for those brands, and they are not a promise that it bolts into every vehicle of each marque. Treat them as an indication of the size and duty class the unit is built for.

As an automotive CO2 compressor it sits in the low-noise AC compressor class: the 30DB AC compressor naming is a class label, and the 12V R744 compressor is matched by specification rather than by vehicle registration.

Because CO2 refrigerant compressor work is unforgiving, this is a specification-match sale. R744 is non-toxic and non-flammable with a GWP of 1 and ASHRAE A1 classification, but it is not interchangeable with R134a or R1234yf and an R134a loop cannot be converted by swapping the compressor alone. Send us your old unit label and system details and we confirm in writing before you pay.

If you arrived here looking for “r744 refrigerant”, “is r744 a natural refrigerant”, you are in the right place: 30DB-R744 is stocked as a replacement R744 multi-fit AC compressor for Multi-fit / universal application — matched by system specification, not by one OE number.

Requests worded as “co2 refrigerant r744”, “r744 co2 refrigerant” come from buyers comparing this R744 multi-fit AC compressor against what is already fitted for Multi-fit / universal application — matched by system specification, not by one OE number.

Requests worded as “r134a compressor specifications” come from buyers comparing this R744 multi-fit AC compressor against what is already fitted for Multi-fit / universal application — matched by system specification, not by one OE number.

Reference / cross-reference numbers are published listings and are shown for identification only; they are not claims of origin or authorization.

• R744 — Refrigerant designation for carbon dioxide
• CO2 — Chemical name for the same refrigerant
• R1234yf / R744 — Separate refrigerant specifications — never mixed in one loop

• Built as a CO2 car air conditioning compressor, not for R134a systems.
• 12V supply for passenger car and light truck installations.
• Low-noise 30DB class naming used for this universal family.
• The universal AC compressor body means one unit can cover several applications of the same duty class.
• New unit, inspected before dispatch.
• Wholesale and container quantities supported with written quotes.
• Specification-match sale: we confirm refrigerant, voltage, pulley and mounting before shipping.
• Supplied with a 12-month limited warranty from dispatch.

• CO2 loop loses cooling and the compressor cannot hold discharge pressure.
• Rough running, knocking or a metallic rattle from the compressor body.
• Refrigerant leak traced to the shaft seal or the port joints.
• Clutch will not engage, or the control valve does not respond.
• Compressor seized after the loop ran dry or was charged with the wrong oil.

• 1Only a technician trained on R744 systems should work on a CO2 loop — the pressures are roughly ten times those of R134a.
• 2Recover the charge with R744-rated recovery equipment that meets the SAE service standard for CO2; do not vent to atmosphere.
• 3Confirm the replacement oil is the CO2-rated type specified for R744 before fitting.
• 4Fit new CO2-rated seals and O-rings, torque the mounting to the system maker’s figure and check belt alignment.
• 5Evacuate, charge by mass to the system specification, leak-test and log the pressures before handing the vehicle back.

• R744 receiver driers and accumulators
• CO2-rated A/C hose assemblies
• R744 service and recovery equipment
• A/C expansion valves
• Compressor clutch assemblies
• Other multi-fit and universal compressors