For what it's worth, the wife's truck A/C was totally shot when we first got it.
We took it to some guys that I know and trust and the total bill was some over $2000 when it was all said and done.
Her truck is a 91 Dodge/Cummins with factory air.
Just a short list of what all we found wrong = compressor shot, condensor leaking like a sieve, fan-clutch shot, two hoses un-usable (one had been spliced with a plain old hose-barb and hose-clamps), that hose is not available anywhere PERIOD and had to be made, hence the hose-barb; the end-fittings were designed such that they had to be sent off to a special facility that was equipped to re-mill the ends and add barbs at great expense, all of this before the local guy could crimp on the hose; many little expensive odds and ends were also replaced.
These guys let me gather my own pieces and charged a very reasonable labor fee for the amount of time they spent on it, so there was no price-gouging going on.
I just relate all of this because fixing A/C is not always an inexpensive project.