... clear Odor OdorlessApplications: HFC134a is used as refrigerant in automobile airconditioning, household and commercial refrigerant applications. It can also be used as ... the existing lubricant as possible, add POE, and run the system on R-12 for some time. When the residual oil ... , remove R12, replace the filter-drier, and charge R-134a. refrigerant gas R134a