the low end pressure servvice port on a 3.9 litre 2001 Lincoln ls is on the ac compresser wich is located on the lower drivers side of the motor. easiest access is to take the drivers side tire off under the a arm.
turn the car on
The hookup is on the passenger side by the firewall, silver canister.
The recharge port is located on the passenger side near the firewall.
Up by the passenger side strut in the engine compartment. Alicia
I'm far from an expert but it sounds like you have a small leak or had one and the A/c just needs a recharge.
Remove the plastic under the cowling against the firewall on the passenger side
Best to take it to a shop, if it needs charged it's leaking
the compressor is located in the lower front drivers side wheelwell. This is also where you recharge your A/C.
How do i Recharge AC Unit for a 1998 Dodge Stratus
The recharge is located right beside the radiator cap. There should be a green Cap on and it should be labeled AC recharge.
i have the 3.4 liter 2000 impala and its up against the top of the firewall towards the middle of the engine
if you are doing backyard repair locate the ac low pressure line its the big ac line at firewall then find fitting with blue cap go to parts store and get refrig kit follow instructions on can