Original suction side fixture

[Ray70Chrg]

I'm in the process of replacing everything in the engine bay to complete the system. Everything in the OE ac/heater box has been attended to a few years ago. I intend to use the original suction and discharge metal fittings. The suction side to the evaporator fitting tube is 3/4"od. That indicates, to me, that the hose was #12 size. The sanden compressor I've installed has a #10 fitting on the suction post. My question is: Is it better, in anyway, to reduce the hose diameter closer to the evaporator or closer to the compressor?

 

[1 Wild R/T]

What I do is use a #10 weld on like this..
#10 5/8" Male Insert Oring Weld on Nut, Steel
I throw it in my lathe & open it up to accept the 3/4" pipe & silver solder it on.... Originally Chrysler reduced that to 5/8' (#10) inside the crimp...

 

[Ray70Chrg]

Thanks r/t for the response, I read all your posts on the a/c forum and knew that you would know how they mysteriously reduced down to #10. Do you think that a low pressure port could be installed into this tubing up nearer the evaporator?

 

[1 Wild R/T]

Thanks r/t for the response, I read all your posts on the a/c forum and knew that you would know how they mysteriously reduced down to #10. Do you think that a low pressure port could be installed into this tubing up nearer the evaporator?

The #10 fitting screws directly into the weld nut... The #8 goes at the discharge of the condenser... Wish I'd aimed the camera slightly more to the firewall...
A/C FITTINGS BEADLOCK,FEMALE STRAIGHT#8,#10 W/134a SERV.PORTS 35B1302-3/BL1303-3 | eBay

 

[1 Wild R/T]

Actually here's my other car.. If you look close you can see that suction tube swedges down to 5/8 just before the weld nut... I use to cut the hose crimp & silver solder to the 5/8 portion of the tube... But it's cleaner & easier to just open up the nut & solder to the 3/4" portion of the tube...

 

[Ray70Chrg]

Hey R/T, Thanks for taking the time and the photos. I knew you would have an easier way of doing this.

Ray