Hi all hope someone can help me hear I looked around and I can't find anything on the site. I just did an engine swap on my 1986 IROC Camaro with a 5-speed computer-controlled carburetor what I'm trying to figure out is how to hook up the air conditioning pump the wire on the compressor is one black wire can I tie it into my wiring somewhere or do I have to do a whole new rewire. I took all the ECU wiring out of the car. Thanks for your help

This black wire is the only wire on the compressor

 

There should be (well, should have been, at one time) a green wire coming out of the HVAC harness... totally separate from anything to do with the ECM. Put the matching "bullet" connector on it and plug that into it.

Of course, once someone has begun "improving" the wiring in their car, anybody else's best guess as to where any given wire is now, or whether it's even still there, is just that... a guess. I'm not going to even try.

 

Thanks I'm the second owner of the car and I took out the ecu harness all the other wires are there just have to find it. The original pump had 3 wires hooked to it .o will have to find them thanks again

 

The HVAC harness comes through the firewall below the heater hoses; pass side, between the tunnel and evap housing. Should have a green wire and abuncha other colors, as well as at least one thin plastic vacuum line (maybe 2). The other wires go toward the top of the evap hsg, to the blower motor resistors; the green goes to the AC compressor. There's usually a connector about at the pass side valve cover with the green, a black, and maybe a red wire in it.

 

I was about to start a new thread when I saw this. I am installing a Sanden SD7 compressor and have similar questions. How do I wire in the high and low pressure switches? I have the plug on the drier but not from the hardline. I know the high pressure switch was on the back of the stock compressor so that needs to be moved. I know that the one wire on the new compressor is the power and the ground is through the compressor casing. I may run a separate ground to the frame.

 

On my car there is some wires hooked to the line coming off the power steering does that have anything to do with it. It's a a/c cut out switch for the AC unit. Here is a photo of it. Its hard to see. Thanks

 

This is the wires from the old compressor

This is the wire from the new compressor

So does anyone know how to wire them together so my A/C works properly. Do I just cut the diode out and splice the two wires together? Thanks

 

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I have traced the wires from the dryer. The sensor on the dryer is low pressure switch. Out of this sensor, a wire goes to the high pressure switch on the back of the stock compressor. From there it goes to the compressor. Then to a ground. The Sanden compressor has no high pressure switch. I am in the process of adapting the sensor on the hard line to a high pressure switch. I have read where some people don’t use a high pressure switch. Also, I have read that the Sandens have the diode built in. I really don’t know.

Anyway, my plan is this: run wire from low pressure switch to a high pressure switch then to the single wire coming out of the Sanden. The ground is through the case.

 

The wire in spot A on the burnt out connector is from the low pressure switch.

 

Hook the green wire of your car harness to that bullet connector on the compressor wiring. I suggest cutting off the bullet and putting a male slide terminal onto the wire that goes into your new compressor, and plugging that into the connector on your existing harness. Cut the round connector off of the black wire of your little harness there, and put a ring terminal of some sort on it, and connect it to ground. Some one of the screws/bolts on the compressor case would be fine. Find the bolt you want to use, and install the ring terminal that matches it, to the black wire of your little AC harness plug. Choose the ring terminal carefully and wisely especially if the bolt you choose serves some critical mechanical or sealing function.

 

The green wire that sofa king is talking about goes through the infamous melted connector behind the passenger valve cover. Find that connector and cut it out. There are many posts that discuss this, many by sofaking. The black wire goes to ground, the green wire goes to compressor. Mine has a 2nd small green wire that seems to go nowhere. You can use an ohm meter to confirm the wire comes from the low pressure switch. I found a high pressure switch that I am going to add to the circuit.

 

Sorry so late in getting back. So this is all I have to do I don't need a high pressure switch on the high side line? Thanks for your help

 

That's it. Lots of cars don't have high-pressure cutoff switches. Including for example my truck which has that same (or a very similar model) Sanden compressor.

 

Okay cool. And the other half of that plug-in I just leave empty I don't put nothing to it. Thanks for your help