Clutch Problems

[sx_coupe]

I posted this in the 240sx section but want to check in this section... sorry for the length of it, here's the deal.

Alright, I bought my car a few months ago, ran perfectly fine for a while (92 240sx m/t coupe), so one day my clutch starts slippin, ofcourse i go "greaat..." and my clutch pedal changes feels before it does it (only when outside is hot or car has been running for a while)... so i go to my mechanic and tell him about my problem, he says could be the slave, but wouldnt hurt to change the master at the same time (he didnt even listen to the part that has to do with outside heat). I got a couple hundred extra in my wallet so why not, he does the work and for a day (a cold rainy day), its all fine until the next day, in the morning i drive to school and my clutch is perfectly fine. I'm drivin back when its now like 80 degrees and before i even start the car i feel alot of resistance from the clutch (this has been so before the master and slave change). So i drive around and its all good except if i push the car a bit in a gear too high it starts slippin, and the feel of the clutch varies, but by outside temperate which is strange to me, if its hot outside, the clutch clamps almost right before the pedal is almost fully released, if its cold outside it clams before mid point. What in the world is the problem? A different, more qualified mechanic said it was my pressure plate but i know people with my problem that had a new clutch kit put in and still had the problem. What do you think?

[NISTECH]

I am thinking the pressure plate too. you replaced the entire hydrolic system already. only thing left in the clutch system is the clutch kit components.