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Re: intermittent A/C problem 2001 4.3L 4x4
Sounds like you are low on R134A.
Go to autozone and get one of the Measure and Charge Top up kits from Interdynamics and remember to fill with the AC on MAX and the fan on full blast.
They come with a gauge that will tell you if you are in the right range.
Remember to get a kit with compressor oil in it. When you install more R134a, you also need to install more oil with it.
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