Look under the hood there are two lines leading to the air conditioner compressor the larger of the two is always the low pressure line this is where you should install 134 freon.
Disassemble the dash, open up the HVAC compartment.
R-134A
Oil and filter change - 7 quarts. 6.6 quarts with a 454
A 2000 Chevy Silverado K2500 with 6.0 Vortec engine.
R134a refrigerant.
R134a.
The size of the gas tank on 2000 Chevy k 2500 is twenty five gallons. This is for a V8 5.7 L.
I have the 4:10 gears and if you run it a 70 mpg i have gotten 14.9 mpg
R-134A
Looking For the answer myself
With the right tools and knowledge, no.
Remove fuel tank for access