I will do my best to describe the problem I am having...if more info is needed let me know. I have a 96 4runner with an A/C issue. The problem is that is works when it wants too. Here is list of things that have been done.

New compressor & clutch
New hoses
Pressure checked and no leaks. Pressure where it needs to be.
New thermastat installed. Never overheated but put one in anyways. Runs @ normal temp.
Fan blows good
Light on A/C switch comes on

When I say it works when it wants too...I mean just that. First thing in the morning won't work...later that afternoon get in it and works good. Sometimes it will work just fine and then start blowing hot. You just never know when it will work or not...hot...cold doesn't matter. Very erratic.

Any thoughts on what I should check next?

 

Expansion valve?

 

Hate to bump an old thread but did you ever find out what the problem was?

Kill

 

From the symptoms I would guess one of the pressure switches had a bad connection or was just a bit finicky .