where is low side port for freon 2003 lincoln aviator

[4re]

I'm looking to add freon to a 2003 lincoln aviator. The vehicle does not blow out cold air, Where is the low side port located. This may not correct the problem I'm hoping the freon is just low.

[4re]

I located the low side port under the hood in front of the passenger side, I believe it had a black cap, once removed there is a quick connect, Do not apply more then 45 on the gauge. Read the instructions on the can for your vehicle.