95 240 sx a/c won't cool!!!! Need a nissan expert!!

[mike454]

I have a 1995 nissan 240sx A/C won't cool.
Here's whats been done: first vac system for 30 mins.....it held vac for 1 hr. so i charged it with 1.3lb of R134a.Started it up and read pressures low side 24 and hi side 160.....no cooling at all.
I added another .25lb of freon to try and raise the hi side pressure to 200(I have seen a few expansion valves that need more than 160 to start cooling)so after adding the freon i have a total of 1.53lbs. according to the sticker its 1.43 +-.11
so i should be right at the max charge.
Now the pressure is 24 on low side and 200 on the high side....STILL no cooling at all.
Soi feel of the liquid line coming out of the comp.and its very hot(normal),hot at the point it goes into the condenser,condenser is very hot for the first few rows,then gets cooler,but still pretty warm(around 125*) and stays that same temp all the way thru the drier and to the firewall(no real difference,which normally means no restriction)or it would be cold due to pressure drop in the liquid line.Anyway sorry for the long description....
Liquid line warm going into expansion valve,then pretty much ambient temp on the low side line coming out of exp valve and stays that way all the way back to compressor.Not a bit cool at all.
I added a little more freon just to see how it would react,and the hi side continued to climb to 270,the fans kicked on and it dropped to around 250,but the low side never changed at all no matter how much was added.
I got up to 2 lbs to see if the hi side cut out worked and it did at 375 she shut off,but even at that high presure the low side never went above 30psi.
So after all that i pulled the freon back out and went and got a drier and an expansion valve,figuring i had a restriction of some kind.
Changed out the drier and exp valve,flushed the rest of the system(ck'd the oil level in the compressor to make sure someone had not added a bunch of oil to it)and it was ok.
Cleaned the evap core out,it was completly full of leaves and pine needles.
Put it all back together,charged it to 1.4lbs of refrig.,and it does the exact same thing......pressures did not change at all,the feel of the lines did'nt change.NOTHING at all.
It acts like a restriction,but when i flushed it out it was easy to blow thru the condenser and evap.core.
I would have bet it was the expansion valve(it did have a little dirt or sludge in the old one,but nothing much).
So the only thing i can think of is maybe a bad "new" valve.
Or something going on in the compressor,but it just does'nt really act like a bad comp....it has plenty of pressure on the hi side,and obviously plenty of suction on the low side. so unless there is some sort of reed valve in there thats maybe cracked or something crazy....i just don't know
I HATE to just throw parts at it,but i'm about out of answers.
Any of you nissan gurus out there ran across one acting like this?
If so i'd appreciate a point in the right direction
Again sorry for such a long post,but i wanted to put as much info as posible in there,to save a lot of getting details.
Thanks
mike454

[PapaSmurf2k3]

AC definitely isn't my forte', but did you say the fans come on immediately after turning it on, or only after you added a metric crap ton of refrigerant?
Realistically, the line coming our of the condenser should be more or less ambient temp.

[mike454]

The fans come on at 250psi on the hi side, that's when the switch on the drier senses that the pressure is too high and kicks them on to bring it down.
They will come on with the 1.50lb charge. The most I put in it was 2.0 lb, which is only 8oz overcharged,that's really not that much in an older system. I see all the time the DIY guy with cans from the zone will just round up to whatever amount is left in the can. If it calls for 1.0lb they'll ad 2 cans which would b 8oz too much. Definantly won't cool as good, but won't hurt anything.
I only over charged it to see if the comp was capable of that Amt of pressure.
Go turn on any automotive( or any unit for that matter, even your house a/c, and feel of the liquid line, don't burn your hand tho :-),it will always be very hot then hot-warm after condenser all the way to orfice or exp valve.
That's what makes the evap turn cold, pressure drop, changing from a liquid to a gas. Normally the feel test will show u exactly where a restriction is,because a restriction acts similar to the orfice in that it slows the refrigerant and when u do that it will be cool on the other side of whatever is slowing it down. That's what's crazy about this one. It should b cooling, but it's not.
It's a weird one, it's gotta be the compressor or a bad new exp valve I'm thinking
But I just wanted to see if a Nissan tech may know of a problem with this particular system design that I'm missing or overlooking.
Thanks
Mike