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Low freon level. When at idle the compressor isn't running at full capacity - so it will work fine. Once you spin up the RPM's - if there isn't enough freon in the system it will cause a "low cut out" to occur as the compressor is moving much more refrigerant through the system and there isn't enough freon in the system to replace what is being pumped.

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Q: Why would the ac system after R134a conversion and replacement of the accum drier pressure switch operate normally at idle for 30 minutes but generate a code 66 low freon within a mile of the house?
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