Air Conditioner Recharge
- Air conditioner recharge gauge set or re-charge kit
- 134a Refrigerant
- Protective eyewear and gloves
AC Compressor With High Pressure Port Step 3 - Once the low side pressure port has been located remove the dust cap and attach the low side pressure hose (blue) and observe the gauge reading. Ambient outside temperature will cause static pressure to vary. As a general rule of thumb the gauge should read between 60 and 80 PSI. If ambient pressures are okay and the compressor is not engaging with the system "on", troubleshooting and repair is needed. If ambient pressure is okay, start the engine and turn the AC system to full cold with a high fan speed setting. The compressor should engage while the low side gauge readings decrease. Step 4 - If the system requires a simple recharge and a "low side" charge kit is being used, while holding the can upside-down slowly open the valve to allow refrigerant to enter the system. (Caution: once 134a starts to flow stop opening the valve, do not open valve fully.) As the 134a enters the system the low side gauge will start to fluctuate, this is normal. As the system is charging grasp the outgoing evaporator line to monitor the temperature, the system is full when the line gets cold. (Caution: Once the outgoing evaporator tube gets cold stop filling the system to avoid overcharging.) (Note: Adding too much refrigerant will inhibited the systems operation.) Once AC system charge is complete, close the charge kit valve, and quickly remove the low side charge port fitting. (Note: Some discharge is normal). Before re installing the dust cap check the port valve for leakage.) After recharging the system check the inside vent air temperature to complete the recharge.