A/C Wiring Question?

[72-CLASSIC_RIDE]

Not certain this is the place to POST this query, but does involve electrical so here goes.

 

My POA Valve on my A/C failed recently and needed a replacement POA Valve.  Well, couldn't locate a OEM replacement so I got on of those POA Valve Upgrade Kits.  It is my understanding the Upgrade Kit allows for the A,.C Compressor Pump to cycle on and off where under the old system, the Compressor ran all the time.  Does anyone know if this is it's purpose for sure?

 

So took my Monte to the A/C Shop and had the conversion done.  Well, found out the A/C guys Wife has a form of Cancer she had just recently started Chemo and has (rightfully) distracted him from his Business.  He had gotten so backed up with work that he just couldn't get back to mine to finish.  So he had already made the conversion, drained and recharged A/C but hadn't completed the wiring through the wiring loom(s) and said a fuse had blown and that's where he ended while checking the system for functionality.  He said everything else had been done and only needed the wiring completed.  (He had replaced the Fuse & I had no further trouble from it)

I expressed my sympathies for his Wife's affliction and I asked if it would make his life easier if I finished up where he left off and he agreed as all that needed to be done was route the 2 new wires from the POA Valve across to the Compressor Pump and Connect each end to the cut wire ends (says it doesn't matter which wire connects to which) on inner fender (see pic).

 

So I jump in the car and drive her back to my brothers house where I will finish the work.  Now my Brother is well beyond me on Auto Mechanics and had a couple questions I could not answer.  After calling and talking to A/C guy, he said if I chose, I did not have to use the electrical upgrade on POA Valve.  He called it a safety mechanism that prevented (and here's where I am fuzzy) excess pressure to build up in Compressor Pump damaging it (that's what I got from our conversation).  He  admitted he should be better versed on our antiquated A/C systems and explained as best that he knew and that's why I'm asking these questions in order to put all the pieces together.

 

Okay, am at home and looking how I will route those two wires from POA Valve across to that cut wire and splicing each end of the 2 routed wires onto each cut wire end.  This is where I start getting confused because earlier in my conversation with the A/C guy, he explained I don't have to have those wires connected at all (but recommended I use it) even though it wouldn't affect the performance of the A/C System. Again does anyone know if that upgrade controls the Compressor Pressure in some way or what is it's function?

 

Moving on I was getting ready to run my wires along the firewall and connect each to those cut wire ends.  I stopped for a little while and lowered the Hood as the Underhood Lamts were on (didn't want to run down battery).  Well, when I raised the Hood back up and started back to work on her, I saw that the plugin socket was sitting oddly and almost disconnected from the POA Valve.  After some investigation I found that that electrical connection interferes when closing the Hood!  The Hood Spring will hit that connector each time Hood closes.  I am hoping I find some 90 degress spade connectors or I am going to have to bend the 2 prongs on the POA Valve downward drastically in order to keep that plugin from getting knocked off.

 

And I find this black wire at the Compressor Pump side of car with a plugin socket on the disconnected end.  I can't see it, but there is place on the rear of the Compressor Pump that this socket plugs into.  I can feel where it plugs in so I connected it (A/C guy said it wasn't plugged in when he got the car) and I can't recall ever noticing it before.  Anyway, it is now plugged in and am curious what does it do?

 

Lastly, I am told I have a Temperature Limit Switch that is designed to short the 3 prong switch out and prevent overheating damage of the A/C Compressor.

 

So from ALL the Info I am trying to absorb, in order to put it in perspective, I believe below are the functions of those issues I described above and they are:

 

1:  Temperature Limit Switch (and this seems pretty straight forward).

2:  A High Pressure Switch (on new POA Valve) that prevents Compressor from over pressurizing?

3:  That Plug In Wire I connected on Rear of Compressor Pump.  (I have no idea what it is for)!

 

So after reading my lengthy explanation, can anyone shed light on these 3 questions?  I have 3 pics with arrows pointing to those questions to help in describing what I have written.

Again any help is appreciated up front......................... 

 

Doug

 

[72-CLASSIC_RIDE]

Spent today routing the A/C wiring and changing how POA electrical plug connects due to the clearance issues I explained in earlier Post.  While I can't say as yet if when I start car and run the accessories to make sure everything still works because Hood was up so long battery got drained (will run checks tomorrow A.M.).  So I modified the POA Electrical Socket so that I could use that function (whatever it may provide), routed the wiring through wire looms and connected the wires as told in discussed in previous Post.  Tomorrow I am removing the Inner Fenders for paint and while out, I am replacing A/C Heater Fan Motor (weak).  With Inner Fenders out, I will check back in Fender corners to make sure no debris and may use POR 15 splashed on protecting against corrosion in that area(s).

So the pic's are what I did today to (hopefully) complete this part of my project.  I have less than 2 weeks now to get her ship shape for the Western Meet.   I will be as done as I can be before that date.

 

Doug