RAM 2500 Truck 2WD V8-5.7L (2008)
Service Port HVAC: Description and Operation
DESCRIPTION
Two refrigerant system service ports are used to recover/recycle/evacuate/charge and test the A/C refrigerant system. Unique sizes are used on the
service ports for the R-134a refrigerant system to ensure the system is not accidentally contaminated with R-12 refrigerant or service equipment used for
R-12 refrigerant.
The high side service port is located on the A/C discharge line. The A/C pressure transducer is mounted on the high side service port See: Refrigerant
Pressure Sensor / Switch/Description and Operation/Description . The low side service port is located either on the top of the A/C accumulator or on the
A/C suction line near the accumulator, depending on engine application. Both the high side and low side A/C service port valve cores are serviceable.
Each of the service ports has a threaded plastic protective cap installed over it from the factory. After servicing the refrigerant system, always reinstall
both of the service port caps.
