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On 134a sysyems there are two ports, The high pressure side and low pressure side. The ports are different sizes. Add refridgerant to the BIGGER or FATTEST port. And remember that 16 ounces is equal to 1 lbs......so two 12 ounce cans equal 1 1/2 lbs. and DONT OVER FILL IT !!! Very costly mistake....and very danger,too.

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