I cannot not find the charge valve for the AC on the low side in my 1999 ford expedition 5.4 liter V8 only the bleed off valve on the high side is readily viewable. Do you know where it is ?

The low side ac valve is locate on the filter dryer. Look on the fire wall area on the passenger side on engine compartment. there you will see a can with a switch and valve. that is the low side charging valve. here is a picture of it. hope this is helpful.

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.

The low pressure service port is below all them wires on the right side of the cowl inside and below the battery about valve cover high,it's on the accumulator,you can't see it you have to feel for it,it points toward the valve cover! Biggest Pain Ford ever came up with!! LoL!!

IAC valve in 2004 Ford Expedition...



Fig. 5.4L Engine LH side view

Good luck (remember rated this)

idler control valve or Vaqium leack

look for the large ac line/hose coming from the ac compressor and follow it untill u come to the ac service port , it is the small port.

it's on the side of the suction accumulator. here's illustration. please rate. thanks.


Item Part Number Description 1 19D594 A/C pressure cutoff switch 2 19E762 A/C charge valve port (high side) 3 19C836 Suction accumulator 4 19E561 A/C cycling switch 5 19E762 A/C charge valve port (low side) 6 19835 Condenser to evaporator tube 7 19860 A/C evaporator core 8 19D734 A/C manifold and tube 9 19703 A/C compressor 10 19712 A/C condenser core 11 19D644 A/C compressor pressure relief valve

the low side charging port is near the AC Accumulator/Reciever dryer cannister in the larger of the 2 AC lines.

They are coded blue and red. Low side, and High side. It's a plastic cap.

A word of WARNING! If you are attempting to recharge your AC, and do not know what you are doing, SERIOUS INJURY or DEATH can result! Connecting a recharging container to the RED HIGH SIDE can result in rupture/explosion of the cylinder.

THIS IS DEPENDENT ON AMBIENT AIR TEMPERATURE , THAT IS TEMP OUTSIDE NEED TO GET TEMPERATURE PRESSURE CHART TO DETERMINE THIS NUMBER , ALSO LOW SIDE OR HIGH SIDE , LOW SIDE PRESSURE IS THE ONE I USUALLY USE TO ADJUST CHARGE , BUT AS I SAID IT IS DIRECTLY RELATED TO AMBIENT AIR SO THERE IS NOT A GIVEN NUMBER SHOULD BE ABLE TO GET CHART @ AUTO SUPPLIER OR JUST ASK ONE OF YOUR AC PEOPLE IF THEY CAN MAKE YOU A COPY OF ONE .