2004 CHEVY TRAILBLAZER Inline 6 cyl. 4200.
I just WANNA KNOW WHERE THE EXACT LOCATION OF THE A/C LOW  PRESSURE REFILL LINE IS TO ADD MORE R134 FREON IN. IS IT NEAR THE FIRE WALL OR RADIATOR SUPPORT?

DOES IT HAVE A BLUE OR BLACK CAP?

THIS IS MY GF'S CAR BUT SHES IN ANOTHER STATE RIGHT NOW WITH THE CAR  SO THIS IS WHY I'm ASKING SO I CAN HELP HER FIND IT.
Answer:
The low pressure A/C freon port is on the accumulator.
The accumulator is the aluminum cylinder looking part under the hood on the passenger side, near the firewall.
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See Pictures Here
Chevrolet Trailblazer Freon Port Location

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