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The service port is on the low pressure line or accumulator. DO NOT under any circumstances use a refrigerant with a stop leak as it will void any warranty and make a mess of the system. To service the unit you MUST know how much is in it and weigh EXACTLY the amount going in. It is best and cheaper to consult a certified repair shop to do the repairs. That is best left to a professional as it requires EXACT measurements of refrigerant. There can be NO guesswork.

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Q: Where is the service port for a 2001 Chevrolet Impala 3.4L?
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