AC Step-By-Step or Where to Start?

Gonzo1970

Gonzo1970

G-Body Guru
Supporting Member
Sep 30, 2018
607
93
I've been checking out the AC Forum, and really haven't seen a Step-By-Step way of tackling an AC System without knowing anything other than "It don't work".

I know next to nothing about AC Systems, and was hoping to find some sort of guide. Am I missing one buried somewhere?

Thanks!

-Gonz
 
Texas82GP

Texas82GP

Geezer
Supporting Member
Apr 3, 2015
5,205
113
Spring, Texas
I can probably help. What do you know about the condition of the system? Has it worked at all under your ownership? Are there signs of leakage at any connections or at the front seal of the compressor?
 
Gonzo1970

Gonzo1970

G-Body Guru
Supporting Member
Sep 30, 2018
607
93
I know it doesn't work. :D

Turn the selector inside to AC and the compressor doesn't kick in. Fuse checked, good. Selector switch good for all other functions, so its not the switch.

From there, I am completely lost. However, there are a couple green wires on the drivers side valve cover that are just sitting there bare. May or may not have something to do with it. I will snap a pic in a little while here.

I could just dump a can of AC stuff in it to see if it will kick on, but not knowing diddly squat about AC Systems, Im not too sure that was a good idea.

1986 Model Year, if that helps with anything.

-Gonz
 
Texas82GP

Texas82GP

Geezer
Supporting Member
Apr 3, 2015
5,205
113
Spring, Texas
Don't just dump a can in it. We can help you. Start with seeing if the compressor is plugged in as Steve suggested.
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
25,907
113
Kitchener, Ontario
if it is plugged make sure you have power to the green wire

actually I jumped a step, you need to make sure you have pressure in the system, the green wire feeding the compressor is alive only if there is pressure so the pressure switch will give power to the compressor. You can bypass the pressure swich on the dryer to see if the compressor kick in
 
Last edited:
olds307 and 403

olds307 and 403

Geezer
Oct 14, 2008
5,209
113
Melville,Saskatchewan
TURNA

TURNA

Geezer
Jul 24, 2009
9,106
113
Socialist NY
If everything is plugged in and not working push the little schrader valve (tire valve) on the AC line

if nothing comes out your lines are empty and that is why your compressor will not turn on

If something comes out you may be low on freon and that is why it is not turning on so add a can



Basically add a can of cheap freon, either it will work, wont work or you will find the leak.

If there is freon in the system and you are just going to open the system put a rag over the schrader valve and then remove the valve.

If you open a line at the evaporator or condenser and dont clean it off good while the freon is in the system.

The freon will act like locktite and you will never get that line off again without twisting the tubing or breaking the line.


If you do get it working you should have it evacuated and refilled
 
Gonzo1970

Gonzo1970

G-Body Guru
Supporting Member
Sep 30, 2018
607
93
Compressor is plugged in.

Green Wire, you say?

Hmm... would it be like this one?

GPwires.jpg



The splices purple one is for the O2 sensor..

(Yeah, I plan on installing the Edelbrock Intake soon... shes a little leaky up there. I just want to get the heated O2 sensor installed and see if that cures my issue or if the carb actually needs rebuilt before tackling the intake)

-Gonz


-Gonz
 

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