if it is like my 2005, you have to jack the car and look just behind the compressor from the bottom. stupid, I know.
You can recharge your 2004 Lincoln LS from the low pressure port. The low pressure port can be found on the top of the air conditioning compressor.
its under the car behind the drivers side front tire ,,air compresser
turn the car on
If you mean the air conditioner, back of the passenger side under the hood by the firewall.
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The high/low pressure lines have valves (1 each) like a tire. You plug a can into each side to recharge. the can will have the fitting and a guage.
The Freon is added through the low side ac port. Using a gauge and the proper type Freon, fill the system to the recommended pressure. Too low or too high Freon pressure will result in the system not operating properly.
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You add refrigerant at the low pressure port but you do not add Freon. You add R134/134a. If you are having to add refrigerant then you have a leak that needs to be repaired first.
low pressure recharge port is on reciver/dryer under brackets by battery. easier to get to if you remove part of the bracket, but it can be done without that if you have small agile hande. the high pressure port is by battery close to front of truck
On the side of the receiver dryer. You can find a diagram of this on the below link. Just follow the "Find your low side Port" icon.
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.