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1977 Chevy AC rebuild #754192
November 16th 2019 9:32 pm
November 16th 2019 9:32 pm
Joined: Nov 2019
Posts: 29
Sarasota Florida
G
GeneralBob Offline OP
newbie
GeneralBob  Offline OP
newbie
G
Joined: Nov 2019
Posts: 29
Sarasota Florida
I have rebuilt the entire ac system from the firewall to the compressor , I have been told to replace the orafice tube and it’s suppose to be in the ac line from the condenser to the evaporator! I have looked for hours for the orafice tube location , took apart every fitting to put new o rings in and still have not found the orafice location ! I am wondering if it does not have one and instead has a exspansion valve inside the cab with the evaporater , no one can give me any info on this , any help out there ?

Re: 1977 Chevy AC rebuild [Re: GeneralBob] #754203
November 17th 2019 7:59 am
November 17th 2019 7:59 am
Joined: Nov 2019
Posts: 29
Sarasota Florida
G
GeneralBob Offline OP
newbie
GeneralBob  Offline OP
newbie
G
Joined: Nov 2019
Posts: 29
Sarasota Florida
Just found a website that shows the system , it don’t have a orafice tube , it has a exspansion valve , why would the auto parts stores not just tell you that verses selling you a orafice tube that don’t fit in the system ?

Re: 1977 Chevy AC rebuild [Re: GeneralBob] #754252
November 18th 2019 8:57 pm
November 18th 2019 8:57 pm
Joined: Apr 2007
Posts: 16
Hurst, TX
1
1983G20Van Offline
stranger
1983G20Van  Offline
stranger
1
Joined: Apr 2007
Posts: 16
Hurst, TX
You probably have a dealer add-on a/c unit. I have worked on a 76 or 78 G20 Van and it had an orifice tube. Right where the metal hard line liquid line runs into the evaporator inlet. The evaporator on a van with stock air is under the hood.

Last edited by 1983G20Van; November 18th 2019 8:57 pm.

1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'

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