Service Port HVAC: Description and Operation

Refrigerant system service ports are used to recover, recycle, evacuate , charge and test the A/C refrigerant system. Unique sizes are used on the two service ports for the R-134a refrigerant system to ensure the system is not accidentally contaminated with R-12 refrigerant or by service equipment used for R-12 refrigerant.

Refrigerant System Service Ports:

The high side service port is on the liquid line fitting located on the receiver/drier. The low side service port is on the A/C suction line located near the A/C expansion valve. Only the low side service port valve core is serviceable.

NOTE: The protective caps aids in service port sealing and help protects the refrigerant system from contamination. Remember to always reinstall the protective caps onto the service ports when refrigerant system service is complete.

Each of the service ports has a threaded plastic protective cap installed over it from the factory. The service port caps are serviceable items.