Underhood A/C Specification Labels
Most R-134a based systems will be identified through the use of underhood labels, or with R-134a refrigerant clearly printed on labels. (Scheme 4)and (Scheme 5). Labels may be located on underside of hood, compressor, firewall and/or strut supports. Before servicing an A/C system, always determine which refrigerant is being used.
Scheme 4
Scheme 5
SPECIFICATIONS
Note. Refer to IDENTIFYING R134A SYSTEMS & COMPONENTS for specificaiton information.
Note. Separate sets of hoses, gauges and refrigerant recovery/recycling equipment MUST be used for R-12 and R-134a based systems. DO NOT mix R-12 and R-134a refrigerants, as their refrigerant oils and desiccants are not compatible. It is NOT possible to clean equipment thoroughly enough to prevent cross-contamination of A/C systems. On systems with R-134a refrigerant, use Polyalkylene Glycol (PAG) wax-free refrigerant oil.