1996 GMC Suburban Owner's Manual - Page 327

Fuel Tank Capacity (Approximate) TYPE Gasoline/Diesel Utility Model - Standard Air Conditioning Refrigerants Not a l l air conditioningrefrigerants are the same. If the air conditioning system in your vehicle needs refrigerant, be sure the proper refrigerant is used. If you're not sure, ask your GM dealer. See refrigerant charge label under the hood for charge capacity information and requirements. QUANTITY 30 Gallons ( 1 13 L) 42 Gallons (159 L) Wagon Model - Standard 6-73