[papacrow]

Just bought a 2001 Expedition and while the A/C seemed to work fine on the (cool) day that I took the test drive, it isn't so cool during this warmer days. The front was just warm at any setting. After adding a little more than a half a can of freon, there is an improvement to the front (actually cold on MAX) but my rear air only cools down to Luke Warm, even on the MAX setting. I suspect that this issue may have been discussed in older post I haven't found it yet. Anyone have any ideas where I might start looking for a solution?
Thanks
BTW.... this is my first post and this seems to be a great forum.

 

[electro]

Your refrigerant charge could still be low. Just because the front has begun to cool doesn't mean the system is full. This illustrates the "guessing game" when topping an A/C, made more difficult since it a dual system.
Any chance we could get some gauge readings?
Is the large line from the rear A/C cold and wet?
If you suspect the system is 100% full, try pinching a rear heater hose to isolate problem.

 

[electro]

BTW.... this is my first post and this seems to be a great forum.

Welcome!
Hope you enjoy it.

 

[papacrow]

Okay, had a friend check my pressure and he says the top is perfect, the lower just a hair high but barely. He thinks its a clogged something or other while his partner says the door on the regulator is not opening all the way. Either way it looks like I'm going be removing the panels on the driver rear to see what I can see. When removing the small access panel I only see three lines going through a metal box. Wish I had pictures or diagrams so that I'd know what I'm looking for (or at).
I'm still slightly puzzled by the fact that the pressures were okay. Even the front air will only really get COLD while in the Max position.

 

[electro]

...Even the front air will only really get COLD while in the Max position.

There is your clue.
Gauge readings tell what the refrigeration portion is doing. It sounds (to your friend) that the refrigeration is OK. I would love to know what those readings are...:ihih: If the readings are good, then you (most likely) don't have a clog. Since it seems to be a dual system it is possible that there is a restriction in the rear portion that allows the front to work.

So, if your lucky, you may have a couple of actuators to replace. It could also be broken temperature doors. I'll see about a diagram.