it may need to be recharged or maybe it needs a new reciever dryer. also could just have a bunch of leaves and pine needle on the evaporator.
i recently put AC in my wife's 83. got all of the parts from a wrecking yard.
you will need:
-condensor
-evaporator (and houseing with the electronics that go with it.)
-hard lines
-flex lines
-reciever dryer.(buy a new one from toyota for 45 bucks)
-brackets for the reciever dryer and hold downs for the hard lines.
-switch to mount on the dash(to turn it on and off)
-ducting
-the AC vertion of heater fan along with the resister and switch(more speeds and heavy duty)
and the pump with it's brackets
belt
i got it all in a kit form from a wrecker for 375. all used parts. of course i bought the reciever dry new and i converted it to 134A and charged it. the 134A is very cold. the dam AC in her truck is colder the the AC in my 2002 taco!
because it was toyota all of the wiring is there. i just plugged it in. as for the lines there were already tapped holes for all of the brackets and such to bolt down.
there where dimples on the fire wall that i used to drill through at with a hole saw for the recieving and returning lines to the evaporator. and also the condensation hose below the evaporator.
on some model trucks i read that there are some cololing things that should be done as well. the were things like and additional fan shroud piece that bolted on the bottom part of the shroud, and some gasket gizmos that sealed the hood to the top of the radiator. basically to force the air to only go through the radiator and condensor.
