R12.... In 1994 R134a was required, but some changed earlier. Yours may have been converted. If the service ports are threaded it still has R12. Hope this helps.
87 MODEL GMC TRUCKS USED R12. YOU NEED TO OEM RETROFITS KIT WHERE YOU CAN CONVERT YOUR R -12 FREON AC SYSTEM TO R - 134A REFRIGERANT SYSTEM.RETROFIT KIT HAS ALL NEW SEALS AND NEW O - RINGS AND ADAPTERS FOR THE LOW PORT SCHRADER VALVE AND HIGH PRESSURE SCHRADER VALVE THE ADAPTERS WILL FIT OVER THE R - 12 SCHRADER VALVES SO YOU CAN HOOK UP R - 134A MANIFOLD GAUGES SET AND R- 134A CHARGE KIT TO NEW ADAPTERS SO YOU CAN CHARGE UP AC SYSTEM. YOUR AC COMPRESSOR HAS TO BE REPLACED EVAPORATOR AND CONDENSOR CAN BE FLUSHED OUT YOU NEED TO FLUSH KIT TO REMOVE ALL THE TRACES R - 12 OUT THE SYSTEM.YOU NEED NEW ACCUMULATOR AND ORIFICE TUBE.THE CHANGE OVER COULD COST $650.00 BUT YOU CAN BUY A CAN R- 134A OFF THE STORE SHELF.R- 12 YOU CANT BUY IT OFF THE STORE SHELF YOU NEED A R - 12 LICENSE AND A AC RECOVERY RECYCLE UNIT. YOU CAN BUY OEM RETROFIT KITS AT ANY AUTO PARTS STORES.
You probably have a system that requires R-12 refrigerant. Look for an ID tag on the evaporator box or possibly on top of the compressor. It will say what type of refrigerant is used and how much the system holds. Late model systems use R-134a and use different size high and low side service ports. You must have a refrigerant license to purchase R-12 in most states.
REMEMBER : Do not overfill the system. Putting in the right amount will produce best results.
I hope that this information has been helpful. Thank you for using Fixya.com.
It was originally equiped with R12 most likely but you will not be able to get that anymore and need to convert to R134A. The conversion kit gives you several items including oil, freon, coupler attachments for low and high sides and dryer filers that need to be installed.
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