Question: Where can I find automotive refrigerant capacities listed online?
Here are a few online sources I think everyone will find useful.
NAPA has capacities in PDF format...
NAPA Temperature Control Products offers a nice 46 page capacity reference guide (in .PDF format) that you can download for free. I like this reference not only because it lists refrigerant quantity in ounces, but because it also lists oil capacity and oil type with recommended PAG oil viscosities. That's something you don't always get. It covers most automobiles and light trucks from 1988 to 2003.
The NAPA refrigerant capacities reference in PDF format can be downloaded from:
Mastercool has an online look-up...
Mastercool has refrigerant capacities listed on their web site. They list refrigerant capacity for cars and light trucks from 1989 to 1999. I don't see Chevrolet listed, but it looks like they have just about everything else.
If all else fails, post your request to the A/C forum. There's a link to the forum on all Knowledge Base pages. Just look for the tab on top that says "Forum." Many of the regular forum contributors will be happy to look up the specifications for you.