Chevrolet 1993 Astro Passenger Owner's Manual page 301

Air Conditioning Refrigerants
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.
Air Conditioning Refrigerant Capacity
TYPE SYSTEM
R-12 3.00 Ibs. (1.4 kg)
R-12 3.75 Ibs. (1.7 kg)
Crankcase
QUANTITY
ENGINE Without Filter
I
With Filter VIN CODE
4.3L
4.5 Quarts
(4.3
Liters)
4 Quarts (3.8 Liters) W 4.3L
4.5 Quarts (4.3 Liters) 4 Quarts (3.8 Liters)
Z
All quantities are approximate.
After refill, the level MUST be checked.
TO1 8 E
Fuel Tank
TYPE
QUANTITY
Standard 27 Gallons (102 Liters)
I
Quantity is approximate.
TO1 87
I
6-65