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Your A/C system will have two service ports, there isn't any "recharge" ports. You add refrigerant to the LOW side only. Prior to adding any refrigerant, you need to check the system pressures with a manifold gauge set. If the system has enough charge and there is another issue, adding refrigerant can make for worse problems. Automotive A/C is best left to the right person with the proper equipment to service them. If you follow the lines from the compressor, the LOW side will be the smaller diameter of the two service ports.
A/C system has a high and low side line. The line you add freon too is the low side. The lines are on the passenger side of the truck under the hood. The larger line is the low side line, follow it from the radiator back toward the fire wall. You will come across a fitting which should have a cap on it, but it may be missing the cap. Thats the low side port.
Sounds like float in fuel tank is sticking. Usually caused by using cheap gas. Fill it up and add a bottle of STP gas treatment. It might take more then one tankful w/STP to clean it completely. TIP: don't rely on the computer generated "mileage left" especially when that low on fuel, that is only an estimate. And also don't let it get that low on a regular basis because it will damage your fuel pump, fuel is used to cool electric pump in fuel tank and running it that low will shorten the life of your fuel pump.
I just recharged my 99 Expedition 4.6 L today. Open hood and stand facing engine, look to left and 1st see the WW washer fill then the battery then at a 45 degree angle look to the firewall where you see a black cover just below the red and black battery cables going in and out of the solenoid. Underneath and behind is the Accumulator. On the side of this silver canister there is a hose coming out of the Accumulator and just to the right of it is a black cap over the Low side 13MM AC fitting. The cap does unscrew but the fitting takes a quick disconnect coupler fitting. I found it helpful to search a parts outlet on the web and print a picture of an Accumulator for the Expedition. I was able to accomplish recharge with everything in place but next time it is likely I'll unscrew the two fasteners holding the wire assembly to the fire wall and move out of the way. Best Wishes. Bruce
There are 2 hoses that come off of condensor in front of radiator. 1 is high side, has large cap on top goes to a/c compressor. The other is low side it, it goes toward firewall into or on the receiver dryer (looks like big can) You will find the charge fitting there. It is a smaller fitting usually blue or black cap on it.