Need help connecting my a/c compressor.

[low91]

Does anyone know the size of the hoses and fittings needed to connect a LS truck compressor to the rest of the system on an OBS truck? I planned on using the peanut style compressor blocks from here,Sending Unit Wizard, and just get the hoses made but I need to know the sizes for the fittings at the evaporator and condensor and also what fittings would have to be built into the hose for charging the system.

Sorry for all the questions, I'm not really familiar with a/c's since i haven't had one in the ten years i've been driving lol.Thanks

[LS1GMCTruck]

Are you able to simply drive it over to a A/C hose shop & have them make them up? They are generally quite affordable to have them make them, even at a drive up shop. Less than $40.00 & your good to go. But...If your in a rural area, that might be a problem.

[low91]

I thought about that but theres not really any shops around here that specialize in a/c services.

[low91]

I think I may have the hoses figured out but does anyone know how to wire the system? Should I use the wiring from the old harness and just wire on the pigtail for the new compressor? or does the LS compressor have to be operated by the new PCM? and if so how do I incorperate my original controls?

[LS1GMCTruck]

I think I may have the hoses figured out but does anyone know how to wire the system? Should I use the wiring from the old harness and just wire on the pigtail for the new compressor? or does the LS compressor have to be operated by the new PCM? and if so how do I incorperate my original controls?

NITROUS! Where are you? He knows this A/C stuff, on our trucks. Let me try to remember. You have a A/C request wire that comes from your dash control. This gets wired to one side of your two-wire low pressure switch thats on your accumulator on the firewall. The other wire from the accumulator switch connects to your A/C request wire coming from your computer. Also from the computer, is a wire that activates the relay, that cycles the compressor on & off. You should also have an A/C sensor plug/wire coming off the harness, that plugs into a hi-pressure side sensor that should be intalled on the hi-pressure side hose somewhere. RedHeartBeat knows this **** too.

[low91]

Lol yeah I had hoped Nitrous would chime in. I remember he kept the LS A/C comp.

[Chevy-Art]

This helped me too, thanks.

[low91]

That 90* fitting still may not clear the mount, it would have to be tweaked a little which could turn out bad since its aluminum. If all else fails I guess I can just go with the older compressor.

Also I'm reworking a DBC harness to replace my DBW setup that I have now. What,if any plugs of the A/C system can I get rid of ?

I was told that I can do without these:
Secondary A/C highpressure switch
A/C request signal
A/C clutch relay control
A/C comp. cycling switch signal

That would leave only:
A/C refrigerant pressure sensor signal
A/C comp. clutch supply voltage

Does that sound right?



I found this fitting on docs blocks but it is for the suction side. They have one for the discharge side but the tube comes out of the side. I'm going to email them and see if I can get this fitting in the smaller size.

[NITROUS]

We could always modify the fitting. I had to machine down my aluminum block for more clearance when the motor torques down on the passenger side.