95 v6 3.2 Clutch problem?

Hello everyone! I really need some help with this one. We started to have clutch problems about 3 years ago in Australia where we were stationed. So I found someone in our community in Sydney who at least had worked on Isuzu trucks. They replaced the clutch with a Jackeroo clutch (Jackeroos are made by Isuzu). Great no problems for about 3 months then the clutch pedal got tight and it started reving and not catching immediately to the point of barely getting anywhere. The kicker was when we drove a long distance like 30 minutes minimum it would start, but if we stopped for a while till it cooled, it started up and took off no problems like it never happened till we like I said before drove minimum 30 minute. We took it back in and they said it just needed adjusted and it was likenewWell we moved here to Turkey and guess what it started happening again. No one can tell us what is wrong and we are moving back to us in August which is no problem but we will have to drive it to our base from a port pick up and we don't want to have to drive and stop drive and stop . Can anyone tell me what to do with it? Needless to say we have tried every route here and all we get is maybe this maybe that. Do I need to buy all new clutch or is it a belt? What about this cooling fan I have read in some of the strings? It only has 65,000 original miles on it. Due to this problem We never have taken road trips in fear of breaking down and having to be towed all the way back to the base.
Any help whatsoever would be greatly appreciated.
We love our car and except for this problem it is roomy, comfortable, and pretty problemless. We have not replaced anything since we bought in 1999 except for like filters and bulbs.
Thanks
The Braggs

I forgot to add it happens worse and sooner when we use the air conditioner......
Any suggestions?