rangerdoc 22 Report post Posted May 11, 2008 Hopefully, this will be my last question about this little R-12 to 134a project. So, I'm all complete but now the clutch on the sanden compressor doesn't seem to work. I tested the power source with my little test light and I get a very weak glow. I tested at the connection between the compressor and power wire as well as where the wire plugs in at the firewall. Do you think the clutch is not getting enough power? If so, I have no idea how to remedy the issue. Other ideas? The system worked fine previously. Help please! Quote Share this post Link to post Share on other sites
daley driver 10 Report post Posted May 12, 2008 try jumping 12vdc to the compressor. Quote Share this post Link to post Share on other sites
rangerdoc 22 Report post Posted May 12, 2008 The electical system is one area I'm not good at. How do I do that? Quote Share this post Link to post Share on other sites
Grabber70Mach 107 Report post Posted May 13, 2008 Unhook wire going to compressor coil, take a short piece of wire and hook one end to the 12V+ on your battery post, the other end to the wire going to the compressor. This is assuming that the coil uses 12V + to activate it. Quote Share this post Link to post Share on other sites
rangerdoc 22 Report post Posted May 13, 2008 I did a direct connect to the battery and the clutch worked. So, now I have to figure out why I'm not getting enough power from the lead out of the firewall!!! I have no idea where that wire goes. I'm assuming the a/c portion of the control panel is working fine since it did before. Ugh...anyone know where an electrical schematic for the a/c system can be found...besides my lost shop manuals? Quote Share this post Link to post Share on other sites
neverhit 10 Report post Posted May 13, 2008 You may want to check the environmental control switches that are attached to the know you turn left or right. There's a wheel with cogs in it that make or disconnect contact with the AC system. Since my radio is out, it's really easy to see it work. Just a thought... Quote Share this post Link to post Share on other sites
rangerdoc 22 Report post Posted May 14, 2008 It looks like the issue is a switch behind the control panel. I cannot find the name of the switch and so far have been unlucky finding it in the parts catalogs. According to the diagram I have, the control lever that adjusts the system from defrost/heater/off/air conditioning is connected to a cog type wheel called a vacuum regulator. On the drivers side of this wheel there is a switch with two wires coming off it. The little white switch is depressed when the selector is moved to the air conditioner settings. I was able to get the clutch to engage a few times when a manually pressed in this switch with a screw driver, though not every time. I think it may be a bit corroded inside. Does anyone know what this switch is called and where I can find one? Quote Share this post Link to post Share on other sites
rangerdoc 22 Report post Posted May 15, 2008 I was able to find a diagram and actual picture in the classic air website. The part is called a micro switch (#16-143). The rotary vacuum switch (#3-110) rotates and depresses the micro switch when the selector lever is placed on fresh or max a/c. Quote Share this post Link to post Share on other sites
