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Which one of service port to fill refrigerant in my van?

(1991 Chevrolet G Series Van (G20))
in Moreno Valley, CA on July 20, 2013
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.
Displaying 2 answers & 4 comments
Popular Answer
on July 20, 2013
Agree with answer 1! Blue is the low side or charging port on the accumulator. ("canister")
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.

on July 20, 2013
Sure thing.
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.
on July 20, 2013
thank you very much!
on July 20, 2013
You are very welcome, and Thank You for the feed back response!
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