Trying insert a/c booster in a 2000 ford expedition

There are many things that can cause this. It could be a stretched or jumped timing chain, low fuel pressure, a bad TP sensor, a faulty MAP sensor, a bad MAF sensor, intake manifold gasket, internal engine damage, or a clogged catalytic converter. I would start with checking compression to rule out internal engine problems. If compression is good on all cylinders next check fuel pressure. If these 2 areas are ok, perform a backpressure test to rule out a restricted exhaust.

On top of AC Accumulator

no pressure in top hose ,where are u losing pressure, the coolant will boil if not under pressure suspect you have a leak or faulty rad cap. some minor leaks dont show until engines warm and are mostly steam leaving little evidence. look for an antifreeze stain or scale deposit around every connection . if electric fanned make sure it works and cuts in before it go,s into the red

Hi, if your charge hose fits on the fitting under the green cap, then that is the right one. Plastic can handle the pressure on the low side. The low side port is always on the line that goes from the firewall to the compressor. So you can trace that line across the firewall and on to the compressor to make sure.

hi, the freon refill point you are looking for is on the accumulator. but you can't see it cause it's buried by the heater hoses, battery cables, and firewall mounted fuseblock. remove the fuse block cover, and get a bright flashlight, look just below the fuse block and you will see the cylindrical accumulator(aluminum canister looking) and the low side pressure port with the plastic cap on it.

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.

on my 2000 expedition it is located on top of the compressor. The compressor is barrel shapped and silver and has a belt attached to it. There are 2 ports on the air compressor, one low and one high. When charging your air conditioner the gauge will only attach to the low pressure.

Hi .. I just ran into the same problem .. I have a 2000 Expedition with the 5.4L engine .. the low side port is located on the passenger side of engine compartment just below the black metal bracket that contains electrical connections right in front of the firewall... you have to reach under this and locate the low side (larger line) and feel for the connection .. it is right in front of the accumulator .. There are two heater hose that hide the port .. you have reach under these to unscrew the port cap which is black .. you'll have to do this by feel .. I have found that you can by R134A charge with dye and leak sealant helps with small leaks .. if the system takes more than two cans be usre to add refrig. oil .. hope this helps

You can only attach the the recharge hose from the kit to the low side ( A/C service port) and the cap should be blue with a leter L on it. Good luck and follow the instruction and don't over charge the system. With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the R134a and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood.  Good luck and hope this helps.

The gauge only fits one port so you can't hook it up incorrectly basically. It wasn't always that way. The old days with r-12 you could make a mistake but car manufacturers finally did something about it. I know the first time it's a little scary, but after you do it,no problem. Have fun!