Need help re: heat/ac #88172 February 17th 2004 10:09 pm | Joined: Jun 2003 Posts: 99 enthusiast | OP enthusiast Joined: Jun 2003 Posts: 99 | Hi, I just bought another '77 Dodge which has factory a/c. Problem I'm having is push button controls for "off" "min a/c" "max a/c" "heat" "def" do not work properly. Push any control other than off, heat comes out def and heat the same. I think the problem is in the vacuum controled push buttons but cannot find vacuum diagram for controls. System is not currently hooked up. Anyone out there have knowledge of where I could find diagram? Tried local Chrysler dealer already. Haynes manual I have for that year does not have diagram. Any help would be greatly appreciated. Cheers! | | | Re: Need help re: heat/ac #88173 February 18th 2004 12:31 am | Joined: Feb 2001 Posts: 2,303 veteran | veteran Joined: Feb 2001 Posts: 2,303 | I had an '85 Dodge with factory air and push button controls. It is very possible problem is in the control panel itself. I had to replace mine when the buttons all of a sudden jammed. I know you say you can still push the buttons and it seems it is stuck in bi-level mode. Do the buttons feel any different? Lose? anything rattling? It is not a difficult or expensive item to repair. I believe it is a common problem since I went to a junk yard first to get a replacement and all dodge vans switches were missing. Don't have my manual handy but just a thought. GupEBoy | | | Re: Need help re: heat/ac #88174 February 18th 2004 12:51 pm | Joined: Dec 2003 Posts: 1,866 veteran | veteran Joined: Dec 2003 Posts: 1,866 | I just looked through my original manual and it doesn't say a thing. I will take a look under my hood to see if there's a diagram. The only problem would be to remove the hood and scan it. I'll get back. | | | Re: Need help re: heat/ac #88175 February 19th 2004 1:09 am | Joined: Dec 2003 Posts: 1,866 veteran | veteran Joined: Dec 2003 Posts: 1,866 | Well I don't have to remove my hood. The only diagram was the emission control B.S. Sorry I wasn't more help. I would listen 4 vacuum leaks, check lines for cracks, ect. S.P. | | | Re: Need help re: heat/ac #88176 February 18th 2004 3:40 pm | Joined: Oct 2001 Posts: 28,125 Madman! | Madman! Joined: Oct 2001 Posts: 28,125 | Greetings MTM41;
You say you have a 77 with factory air. The controls you are explaining sound like from a 78 and up van. My '77 had factory air and it looked like an aftermarket unit that was installed at the dealer. I don't believe before 78 they actually had in dash air. At least I never saw one. If this is the case and someone added the air to your van maybe the vacuum lines are mixed up or not all on. | | | Re: Need help re: heat/ac #88177 February 18th 2004 4:02 pm | Joined: Dec 2003 Posts: 1,866 veteran | veteran Joined: Dec 2003 Posts: 1,866 | My '77 manual shows 2 different heater controls w/air. One for the compact dash and one for a regular dash. | | | Re: Need help re: heat/ac #88178 February 18th 2004 4:25 pm | Joined: Feb 2004 Posts: 27 newbie | newbie Joined: Feb 2004 Posts: 27 | Are you sure the buttons are vacuum because in my chiltons i have the control unit schematics but shows no vacuume lines just electrical. there should be 4 electrical connectors on the back. 2 three prong and two single prong. there does appear to be three other prong on the left of the unit, I cant tell from the drawing but they could be the vacuume connections. If you need info on the wiring i can help but i have no info on vacuum lines. p.s. it sounds more like a problem with the vent control cable | | | Re: Need help re: heat/ac #88179 February 18th 2004 4:29 pm | Joined: Jun 2003 Posts: 12,898 Vanner | Vanner Joined: Jun 2003 Posts: 12,898 | Any time a manual is not available, borrow a smoke generator, Sometimes Canadian Tire may lend you one, unhook any vacumn line form the engine, plug the end and run smoke through the system. The smoke will show any leaks. Since you are also having trouble with the tranny, I suspect a vacumn leak on the manifold, or the kick down system. If you have a stethoscope, take off the medical end and insert a 12 inch section of new steel brake line. With the engine running, search around the manifold and a/c controls for leaks. You will hear them .. Trust me, I am a Doctor. | | | Re: Need help re: heat/ac #88180 February 18th 2004 5:23 pm | Joined: Dec 2003 Posts: 1,866 veteran | veteran Joined: Dec 2003 Posts: 1,866 | Is the van idling rough? That to might indicate a vacuum leak. I used a propane torch *unlit* around my carb ect. and when the propane replaced the air that was being sucked in the rough idle dissapeared. I then knew the leak was in the area the propane was in. This will not help if it is a vacuum line. That smoke idea sounds like a winner though. | | |
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