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Q:

ac accumulator/dryer needs to be replaced. on 2000 Chevrolet Blazer

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ac accumulator/dryer needs to be replaced. It is leaking around the low pressure switch, or cut-off switch.
(1) Answer
I have a 2000 trailblazer that was leaking refrigerant at the clutch pressure cycling switch on the accumulator. Remove the switch and replace the "O" ring on the shaft. I also put a bead of RTV sealer at the switch base. No more leak!!