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You may just need some refrigerant. R-134a, NOT R-12. Is your check engine light on? If so, Auto Zone can tell the codes that may solve your problem if there is a mechanical problem in the compressor, condensor and/or accumulator.

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Q: What would be the problem with the AC on a 97 Sierra will not hold a charge cant pull a pressure test When you charge it it will blow cold air for about 20 min then hot again?
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