An automotive air conditioning system is a closed loop. As the refrigerant moves through the system it is subject to pressure variations which change the phase of the refrigerant from liquid to gas and back again. As these phase changes
Service Port Caps—Small but Powerful
Although many techs know (or suspect) this, it may surprise DIYers to know that service port caps are THE primary seal for a vehicle’s A/C system’s service ports.  Many erroneously believe the Schrader valve provides the seal for the ports,
Find Your Low Side Service (Charging) Port
An automotive air conditioning system is a closed loop. As the refrigerant moves through the system it is subject to pressure variations. This pressure changes the phase of the refrigerant from liquid to gas and back again. As these phase