no such thing
AC relay is inside fuse-box on driver-side inner fender. Relay diagram is inside cover.
R134a
R134a
R134a
R134a
it's in the high pressure side of the ac line
R-134
Aprox 12 qts, it varies if you have ac or not.
How to remove and install the serpentine belt on 1991 Chevy Blazer with AC?
You don't have one; crack a line to drain it.
it is located in the bottom line under the accumulator
Check all of the following............. 1. Pressure switch. 2. Pressure switch pigtail. 3. A/C heater controller.........