Where is the low side of the AC on a 2001 Aztek?

On a 2001 Pontiac Aztek, the low side service port for the air conditioning system is located on the larger diameter aluminum pipe that runs from the evaporator to the compressor. It is typically found near the firewall on the passenger side of the engine bay. The port is usually capped with a blue or black plastic cap and is marked with an "L" for low side. Make sure to check the vehicle's manual for specific details and safety precautions before servicing.