Which port do you add freon to on a 2001 f250

you never work from the high pressure side of an a/c system. EPA requires it to be recycled, freon is removed using a vacuum tool on the low port until the system holds vacuum for 5 minutes. Then the recycler is removed and freon is added. You mean R134 right?

The Low Pressure Port is where you want to charge. It should have a blue cap. Here is a picture of the Low Pressure Port:



I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

THE LOW PRESSURE LINE IS ALMOST ALWAYS LOCATED ON THE WIDER PIPE OF THE 2 AND SOMETIMES THEY HIDE IT UNDER THE AIR CLEANER ASSEMBLY.

Follow the large low pressure line coming from the firewall,going into the passengers compartment under the windshield ,it will have the low pressure service port on it,and it is the only service port the service hose you have will fit.

Follow the large line from the firewall it is the low pressure line,it will have the service port on it.Use the one hose kit from the auto parts store and apply the freon can on one end,and clip on the other end on the service port,then start the engine turn the ac on high bloewer motor,and max air,or recirculation,

YOU NEED TO ADD MORE FREON TO THE UNIT. SOUNDS LIKE IT NEEDS TOPPING OFF. YOU CAN BUY R-134A FREON IN A PACKAGE WITH A HOSE AT A PARTS STORE. DON'T KNOW HOW TO CHARGE THE UNIT , NO PROBLEM. OPEN HOOD, START TRUCK,TURN A/C TO MAX WITH BOTH DOORS OPEN RUNNING AT
NORMAL SPEED, NO REVING, THEN FIND A BLACK METAL PIPE
RUNNING FROM A SILVER DEVICE CALLED AN ACCUMULATOR.
THE PIPE WILL HAVE A CONNECTOR, JUST UNSCREW THE CAP
AND PLACE FREON HOSE WITH THE CAN CONNECTED TO IT AND
SECURE THE END OVER THE PORT VALVE. OPEN FREON VALVE ON THE CAN AND PLACE UPRIGHT AND LET IT SIT. WHILE INSTALLING THE FREON, FEEL THE VENTS BY THE DOORS OR
DASH TO SEE IF THEY ARE GETTING COLDER. WHEN THE VENTS ARE COLD YOU CAN TURN THE VALVE OFF ON THE FREON CAN
AND DISCONNECT IT FROM THE FITTING AND PLACE THE CAP
BACK ON THE VALVE. THAT'S ALL THERE IS TO IT. YOU CAN ASK THE PARTS STORE CLERK WHICH PORT IS FOR CHARGING THE UNIT IF YOUR UNSURE. THEY ALSO SELL R-134A FREON WITH A
SEALANT MIXED IN WITH THE CAN JUST IN CASE YOUR UNIT MAY HAVE A LEAK IN THE SYSTEM. REMEMBER, **NO REVING** NO
MATTER WHAT ANYONE SAYS. THE SYSTEM WILL NOT CHARGE FASTER. IF YOU WANT FASTER CHARGING THEN KEEP THE CAN WARM. FREON WORKS WITH AMBIENT TEMPERATURE WHICH
MEANS WARM DAY OR CAN IS FASTER THAN A COLD DAY AND
A COLD CAN. FREON MOVES FASTER WHEN HEATED.

follow the larger ac line of the to sizes until u come to a port it is the low side ,is the smaller port this is what u want

I just did this on my f150 supercrew, which looks identical to my 2000 expedition. follow the freon lines, usually next to the battery, to the firewall. tucked against the firewall is the condensor and just above it is the low pressure access port. I topped off my freon using a kit with a pressure gauge. the before pressor was 40, and after the freon addition was 50. Made ALL the difference between a slightly cool AC and FREEZING COLD AC. Total cost with tax for the kit was just under $30. The kit inclued an 18 oz refill container (17 oz freon + 1 oz synthetic lubricant in the can) and reusable hose/pressure guage.

You need to locate the low port on the AC.

You recharge the AC connecting to the low port.

You find the AC low pressure at the top of the compressor. Near the compressor you find two ports, the high port and low port.
You can follow the compressor line to reach the port.

To find out which one is the low port, run the air conditioner for a couple of minutes withthe engine on.
Then turn off the care and touch the lines from compressor to the two ports , often covered with plastic caps. Only one of the pipes will be cold, the line that is cold will lead you to the low port.

Unfortunately I am aware of no pictures or diagrams. There are two connections, a low pressure and a high pressure connection. The high pressure connection is found between the engine and the firewall. The low pressure connection is in front of the engine along the inside lip of the hood closure. As you open your hood, it's located just in front of your lefty knee. The connection is on an aluminum tubing, and mine has a black screw cap on it. Not sure if the cap varies in colors, or whether your may have been removed. The connecting hose from your freon refigerant H134a will ONLY fit onto the low pressure connection. The charge is just a bit more than 2 pounds of freon. In a 2001 you may need to add more than i can if the car has never been recharged, but start with one can and see how it goes. You may also want to add a freon with a sealant just in case you have a small leak. One can is approximately 13 ounces.