is the compressor running or not ? You need to know the hi side pressure also. If the compressor is running and you have 85 psi on low side you either have way too much freon in it already or an expansion valve problem if thats the type system. On an 85 degree day with compressor running I would expect around 35 psi on low side and 225-250 psi on hi side depending on humidity and airflow on condenser, low side will creep down as interior cools. If you dont have guages to read both sides, take it to someone who does, or you may have a can blow up in your hand if you try to add more freon.
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