RAM 1500 Truck 4WD V8-5.7L VIN D (2005)
Service Port HVAC: Description and Operation
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. The low side
service port is located on the accumulator. 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.
