How Do I Keep My AC Cold?

HOW DO I KEEP MY AC COLD? AIR CONDITIONING ON ВАР MODE BUYAUTOPARTS Use a manifold gauge set to get a low side and high side pressure reading. These gauges are available at any local auto parts store for an affordable price. The ideal reading pair is 150+ on the high side and 30 on the low side; this is considered "In Range". 30 225 150 3003 20 ] -10 50- 75 375- AC WORKING PROPERLY 425 low side pressure PSI high side pressure PSI CHECK AND REPLACE AS REQUIRED In range In range AC is working properly Low Low Add refrigerant Need service, possibly blockage of the expansion valve or orifice tube Low Low High High Need service, possibly faulty compressor Low Low System is overcharged. Slowly remove refrigerant. Venting is illegal in USA The graphic below shows common low side and high side readings, what they mean, and what you can do to help keep your AC cold for each reading. Gauge indications shown below are taken under the same ambient air (86-95 F) and humidity. High 160 ! Low 10 High 250 Low 50 Evaporator frosted or low pressure piping faulty, or expansion valve Overcharged system or condenser issue Recharge system and inspect condenser for blockage Check the evaporator, piping and expansion valve - replace whichever is needed High 225 I Low 80 High 200+ I Low 70 Blockage in system Expansion valve too wide open, heat sensi- tizing tube faulty, or too much refrigerant Find blockage and replace Recharge system High 75 Low Vacuum High 150+ I Low >10 Expansive valve open or leak Refrigerant fails to circulațte Check valve or complete dye test to find leak Check for a clog High 120 J Low <10 High 125 Low 30 High 100 Low 100 Water in the system Not recharged enough or too much oil Faulty compressor Evacuate AC system for 30 minutes, dry and refil Check amount of refrigerant/oil Compressor will need to be replaced