Look on the line up under the wiper cowl on the firewall.
Yes
The low pressure service port, which is the smaller one.
No, a 2002 Dodge does not have an USB port.
The Low Side Pressure port is toward the front of the vehicle. It is on the line that goes striaght up from the compressor and then turns toward the firewall. The port is on the part that is coming up from the compressor. It is just behind the fan - so BE CAREFUL WHEN THE ENGINE IS RUNNING!
the low pressure port is right on top of the comperssor
The 2006 Dodge Caravan OBD 2 port is under driver side dash lower left instrument panel
The 2003 Dodge Grand Caravan OBD 2 port is on lower edge of dash above parking brake pedal
The 2003 Dodge Caravan OBD 2 port is on lower edge of dash above parking brake pedal
Follow larger line from compressor--may be near drier on passenger side firewall
Follow Larger hose from compressor-perhaps near firewall around drier
Look on the lines near compressor. Somewhere si one with a blue cap.
Near the left hood hinge, clipped into a protective cover.