Ahhh..... The AC, the argued pinnacle of 1st Gen ownership!
If you've ever ventured down this road, you'll completely understand. Ports, fittings, o rings, hoses, shraders, compressor, evaporator, accumulator, switches, sensors, the list seems to never end. I love this forum, but NO ONE online can diagnose your system until you put some dye in it!
I am very fortunate to have a great, honest AC shop near me. I explained my mechanical knowledge and asked them to point me in the right direction (to save some $$$). I kicked on my AC, they did a quick charge to my empty system, and within 30 seconds I was asked if I off road my truck a lot. My response... yes, I beat the living hell out of it!!! He grabbed the portion of the evaporator tube that connects to the accumulator and shook it back and forth. The play indicated a busted evaporator, which apparently is a more common occurance on trucks that get shook to death regularly.
At this point I had done the simple things, new service ports & o rings, but the evaporator diagnosis was dreadful, I knew the entire heater box needed to come out. I finally bit the bullet, and the AC shop was spot on with their diagnosis. I got r done, and back to the AC shop I went. They vac'd the system, found & fixed a shrader & bad line, the new oriface tube I put in was instantly destroyed as the system saw pressure for the first time in who knows how long. The tube was replaced, the system was oiled/charged and folks, I'm proud to announce, I have a fully functional AC on a 26 year old first gen Explorer! It's surreal, I've spent thousands of hours in these trucks and never experienced a freezing cold rush of air. It blows so hard, & combined with my heat reflective window tint, I have to take it down a notch or two when it cools off!
I'm in love, my off road season is now year round!
Rough costs:
Evaporator - $100
Misc ports/O rings and 3 cans of refrigerant to realize the problem is bigger than I can handle - $50
AC Shop - $250
I'm ecstatic if you can't tell! Well worth the money, and could have easily been twice as much. I cringe thinking what the AC shop would have charged to do the evaporator.