* AC system options: The factory offered various AC system options, each with different components and capacities. Some vans might have had a smaller capacity system installed while others had a larger one.
* Compressor manufacturer: GM likely used compressors from various suppliers (e.g., Sanden, Harrison) during the 1976 model year, and each would have slight variations.
To find the correct information:
1. Check the vehicle's underhood sticker: Look for a sticker on the radiator support or inner fender well. This sticker often lists the AC system specifications, including refrigerant type (it would likely be R12, which is now illegal to use or purchase in most places, so you'd need a conversion to a modern refrigerant like R134a) and the capacity.
2. Consult a repair manual: A factory service manual for a 1976 Chevy G10 with a 350 engine will provide the precise specifications for the various AC system options available that year. You can often find these manuals online or at auto parts stores.
3. Inspect the compressor: The compressor itself often has identifying numbers stamped on it that can be used to find the specifications. You can then cross-reference those numbers with online databases or parts catalogs.
Without access to your specific van's documentation or the compressor itself, providing the exact freon capacity and compressor type is impossible. Remember to replace R12 with a modern, legal refrigerant and have the work done by a qualified technician because of the environmental concerns and potential safety hazards associated with working with refrigerants.
