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Hi, I do not see that your question has been answered, so I will answer it since I also have a 2004 superduty.
You add a/c gas to the low pressure port between the passenger side battery and the radiator. It has a black cap, and your a/c equipment should have the right fitting to attach to this no problem. Good luck!
What else can I help you with?
What kind of freon do you add to a 2004 trailblazer?
R134a
Where to add freon to a 2004 Ford Expedition?
Which do i hook to to charge the freon in a 2004 ford expedition
How to add freon to my 2004 ford explorer?
Ask answers.com
Can you add freon to 2004 dodge Dakota?
YesYes
How do you add freon to a 2004 Lincoln ls?
I had an additive put in my Lincoln ls. I bought the adapter needed to add freon. It was located on driver side in front of tire.
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on the low side pessure port of the compressor line
Where do you add freon to ac on 2004 f250 super duty?
To add freon to the AC system on a 2004 Ford F-250 Super Duty, locate the low-pressure service port, which is typically found on the larger diameter aluminum line between the compressor and the evaporator. It’s usually covered with a plastic cap, often blue in color. Make sure the AC system is off before attaching the refrigerant can, and follow the manufacturer’s instructions for proper filling. Always ensure you are using the correct type of refrigerant for your vehicle.
Where do you add freon on a 2004 Ford Freestar?
Freon is added in the low pressure port of the ac system. It is on an aluminum pipe on the passengers side, close to the ac drier.
How do you add freon to a 2004 Chevy Express?
Buy a kit at Wal-mART OR AUTO PARTS COMES WITH INSTRUCTIONS
Where do you add freon to your 1999 Honda Accord air conditioner compressor?
You don't add Freon as it has R134a not Freon. You add it to the low pressure side which is the larger hose.
How do you add freon to 2002 Lexus sc 430?
Take it to the a auot shop. you can not add freon
Where do you add freon on a 1997 mountaineer?
Contains no Freon. Freon was banned beginning in 1996.
