Service Port HVAC: Locations

A High pressure connection
B Low pressure connection
B12 Refrigerant pressure sensor
B12/1 Refrigerant temperature sensor
M4 Auxiliary fan
1 A/C compressor
2 High pressure line to condenser
3 Condenser
4 High pressure line to receiver/dryer
5 Receiver/dryer
6 Low pressure line to evaporator
7 High pressure line to evaporator
8 Expansion valve
9 Evaporator