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There is no test port.
The 1991 VW Jetta low pressure port can be found on the air conditioning compressor. There are two ports, the low pressure port will be labeled as such.
The 1986 Nissan King low side port can be found on the air conditioning compressor. The low side port will be labeled as the high pressure port.
Yes
The low pressure port is the one on the accumulator (the canister). The low pressure lines are the bigger lines and the high pressure are the small lines.
You can put Freon into your 1997 Nissan Pathfinder from the low pressure port. Connect the Freon bottle to the port. Release the Freon into the air conditioning system.
On top of the right fender well.
It is the port on the aluminum line running right behind the radiator, near the radiator cap.
Larger hose from the air compressor
where is the diagnostic port on a 95 Nissan quest van
The low side charging port is located high up, near the firewall, on the driver's side, right by the brake master cylinder.
If you are facing the engine from the front, look on the right side and down probably about 9 inches or so. The low pressure port is on the larger of the two hoses that go into your AC. This is the only AC hose on the right side.