GMC 1999 Sierra 1500 Pickup Owner's Manual page 375

Air Conditioning Refrigerant Capacity
TYPE*
QUANTITY
Refrigerant R-12
2.5
Ibs. (1.1 34 kg)
*Not all air conditioning refrigerants 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.
TO223
Fuel Tank Capacity
TYPE
Gasoline, Diesel
with Short Bed
with Long Bed
Four Door Model
Standard
Chassis-Cab Models
Standard (Side Tank)
Optional (Rear Tank)
Standard (Side Tank)
Optional (Rear Tank)
3500 HD Models
QUANTITY
-
.-
-
All quantities are for a completely dry tank and are approximate.
TO1
8 C
26 Gallons (98 Liters)
34 Gallons (128 Liters)
34 Gallons (1 28 Liters)
22 Gallons (83 Liters)
30 Gallons (1 13 Liters)
21 Gallons (80 Liters)
32 Gallons (121 Liters)
6-97