which one of service port to fill refrigerant in my van? on 1991 Chevrolet G Series Van (G20)

one with blue cap attached to the canister and orange cap attach to the pipe going lower part of the canister? Pleased advice, thank you in advance! Omie.

by in Moreno Valley, CA on July 20, 2013
2 answers 4 comments
ANSWER by on July 20, 2013
The high side port is a different size than the low side fill port, so the freon adapter will only fit the low side. Take the caps off and see which one it fits.
COMMENT by on July 20, 2013
thank you very much!
COMMENT by on July 20, 2013
You are very welcome, and Thank You for the feed back response!
ANSWER by on July 20, 2013
Agree with answer 1! Blue is the low side or charging port on the accumulator. ("canister")
COMMENT by on July 20, 2013
Thank you so much! Lightsaber and Pushrod, Thanks pal I made it, it was so easy appreciate you're help. Again thanks to both of you. Omie
COMMENT by on July 20, 2013
Sure thing.