14/03/2025
R744/CO2 systems have been utilised in recent models of Mercedes, Volkswagon and Audi. Manufacturers have opted for this refrigerant as it is supposedly a more environmentally friendly replacement for the R-134a, R-134YF and R12 refrigerants used in most vehicle’s air-conditioning. As this refrigerant is not used in Mercedes sold directly to the NZ market, Mercedes does not have the equipment for these cars at the dealership.
Unlike the more conventional refrigerants, R744 refrigerant is pure CO2, hence requires specialised leak detection tools and parts. R744 has an intensely high system pressure, averaging at 1600 PSI. (In R134a vehicles, system pressure is typically 150-250 PSI). This can make the system quite dangerous to repair as the high-pressure CO2 can be damaging to the technician if not handled correctly. R744 systems are also hard to diagnose due to the refrigerant being sticky, often coating places outside and around the actual leaking component. Additionally, CO2 is in the atmosphere, often making even the specialised leak detectors difficult to utilise. We find that some components that are reinforced to suit the high pressure of the system, are more prone to damage as the reinforcement makes them more rigid.
CoolCar Hamilton is proud to be the only workshop currently operating with the equipment and know-how to fix these cars. Despite opening 30 years ago, our methods are updated with the times, we are always learning new things, and attending training with VASA to improve our performance so that we stay the best in the industry. 💪❄
Phone 0800 COOL4U to learn more about how we can help you with your R744 system.
