Hi everybody i want some help , iam a technision in air conditions ,i was fix a central ac carrier and i found that everything works good the compressor and the high pressure fan and indoor fan ,but the problem was there is no cooling and the low pressure pipes werent cool and no drop of water on it , what i do ??????????

if your pressure is 65 psi and the unit does have r-22 - you need to check hi press side - should be 225 -270 - if this is low - compressor valve problem - if hi and low side is normal there could be some type of air flow problem - fan blades dirty/ coil dirty - if this is a heat pump - problem could be in reversing valve - only other thing i know of is the wrong freon type could have been put in unit - you would have to start over with freon charge and put in the correct amount as required on unit data plate if your pressure is 65 psi and the unit does have r-22 - you need to check hi press side - should be 225 -270 - if this is low - compressor valve problem - if hi and low side is normal there could be some type of air flow problem - fan blades dirty/ coil dirty - if this is a heat pump - problem could be in reversing valve - only other thing i know of is the wrong freon type could have been put in unit - you would have to start over with freon charge and put in the correct amount as required on unit data plate