low pressure port for A/C

Hello all:
I have a 99 Expedition Eddie Bauer edition 4X4 with the 5.4 Triton engine.

I am trying to add some coolant to my air conditioning system. I have purchased the kit, but for the devil of me, I cannot locate the low pressure port to add the coolant.

Can someone help me with this? I would greatly appreciate it.
Thanks,
Tom

The Bigger of the 2 hoses is your suction side , follow it,around , an you should find the fitting, if its color coded its a blue cap .

It might be a black cap, but no worries, low pressure fitting only fits that fitting. And if its out you probably got a leak and adding freon not going to last that long.

Hi:
I appreciate the effort, but so far you guys haven't been much help.

My brother and I ( and my brother teaches auto shop in a high school) have been all over and under the engine, but can not find the low pressure port. The top port is sitting in plain view and is very accessable. The location of the low pressure port remains a mystery. My guess is that it is hidden behind a panel or something and I would like to avoid tearing apart the engine on a scavenger hunt.

I am aware that the valve fitting on the recharge supply will only fit the low pressure port. That much was explained to me by the guy at the auto parts store (who also couldn't find the low pressure port).

I am also aware that there might be a leak, but the A/C does blow cold - it just takes a little while to get there. That leads me to believe that there is refrigerant in the system (not freon, but R-134), but it is low. In the long run, if and when I do find that low pressure port, I might discover that there is indeed a leak, but being a do-it-yourselfer, I am attempting to solve this problem at the lowest cost possible. So far, I have about $20 invest in a can of R-134. I would like to pursue this course of action until I am forced to do otherwise.

I was hoping that someone out there had actually recharged their A/C system and could tell me exactly where the low pressure port is.

Thanks again. If I happen to find the answer via another source, I will be happy to share the good news so we all have a little morei onfo on this site.

Thanks again for your help.

Facing your engine, look on the left side of the firewall. There will be a bracket that holds the vacume solenoids for the 4x4. Look underneath this bracket. You should see a canister(dryer) for the a/c. The low port is on this canister. Is VERY hard to see!

^ he is right! It is easier to remove the plastic cover to see it on the passenger side of the firewall. I had to do one before and took forever to find it.

he teaches auto shop and cant follow the ac lines!!!