Chevrolet 1994 Astro Passenger Owner's Manual page 293

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. For additional information, see
your "Warranty and Owner Assistance Information" booklet.
Air Conditioning Refrigerant Capacity
TYPE
R-l34a
R- 1 34a
SYSTEM
C-60**
C-69***
*All Quantities Are Approximate
**Front A/C Only
***Front & Rear A/C
QUANTITY*
2.00 lbs. (.91 kg)
3.00 lbs. (1.36 kg)
~~
~.
NOTICE:
R-134a refrigerant is not compatible with R-12 refrigerant in
an air conditioning system. R-12 in an R-134a system will cause
compressor failure, refrigerant oil sludge, or poor air
conditioning system performance.
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