One of the most frequently asked questions we get at A/C Pro is “How do I find the low-pressure port on my car?”

The low-pressure service port is where you connect to the air conditioning system. You might do this for various reasons, such as to:

  • Recharge it with A/C Pro
  • Seal leaks with Super Seal
  • Learn how to fix your own A/C problems to save cash

The exact location of the low-pressure port varies between different car models, though it’s easy to spot once you know where to look.

Discover how to find the low-pressure A/C port on any vehicle in just a few simple steps below.

Find the Low-Pressure A/C Port

Start at the A/C compressor. It’s attached to the front of the engine and powered by a belt and pulley. It can be at the top or down along the side of the engine, as shown in these two examples:

One way to tell the compressor apart from other belt-driven parts – such as the alternator – is to turn the engine on but turn the A/C off. The compressor will be the only pulley that’s not turning.

The A/C compressor can also be identified because it has two metal tubes coming out of it.

The two tubes are different sizes.

The smaller tube is the high-pressure line. The larger-diameter tube is the low-pressure line, which is the one you’re looking for. It runs from the compressor back towards the passenger compartment.

Follow that line until you find the one and only valve that sticks out of it, which looks like this:

It should be covered with a plastic cap, which you can unscrew to access the service port.

This is the one and only place on the entire car where the A/C Pro connector will both fit and lock on.

Check out our port locator tool to find the low-pressure service port on your vehicle.