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Buy a whole kit from Griffiths or Rennaire. Not cheap, but neither is replacing one component at a time. For sure you need a compressor and evaporator, might as well do the hoses too. Particularly since the system hasn't run for 7 years the seals are likely dried and cracked so they will leak. And yes you can get newer components that are more efficient. Who know's you could replace a few things and everything will be OK, but what you've got now is all 25 years old so it's more likely that if it hasn't failed yet it will soon.
I replaced my system with the Rennaire kit running 134a three years ago and no issues since. I have not had to recharge it yet. I just wish I had upgraded the evaporator fan when I was in there because now its starting to squawk.
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1986 Carrera Coupe
1999 Chevy Tahoe
1987 Chevy Blazer
1955 Chevy Apache 3100 Pickup
"A little knowledge is a dangerous thing"
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