Billabob Posted June 16, 2023 Share Posted June 16, 2023 My original vacuum ball got shattered into a thousand pieces and I’m noticing that there are quite a few variations on Ebay. Some are round and others are oval. Some have 1 inlet, others have 2 or 3. I bought the cleanest one thinking they are all the same but it only has one large inlet. I do not have a vacuum disconnect anymore but it would be nice to have the blend doors working. Does a single inlet ball equalize the pressure in the manifold enough that I can tee in the HVAC line elsewhere? Link to comment Share on other sites More sharing options...
87MJTIM Posted June 16, 2023 Share Posted June 16, 2023 The oval one is if you have cruise control. Link to comment Share on other sites More sharing options...
cruiser54 Posted June 16, 2023 Share Posted June 16, 2023 HOrnbrod Moderators 20.2k Location: Sweet Home Alabama Posted November 21, 2016 New members to the forum, and some longtime members too, post technical questions in this forum but do not provide specifics of the MJ they are referring to. Like: Year of Manufacture Engine Drivetrain Body Style Etc., Etc. These details are necessary for responders to accurately answer your questions without guessing or having to ask what are the specifics of the MJ you are referring to. You can add these details easily and permanently by creating a signature or adding your truck details to your existing signature. Here's how to do it: 1. Click on the upper RH icon to open the drop-down menu 2. Click on Account, then Account Settings 3. In the Settings menu click on Signature 4. Compose your signature, or add to your existing signature 5. When complete, click Save Quote With tapatalk you have to go to the main page where it shows you the icons of the groups you are in. at the top there should be an icon of a person, then go to settings, then signature. Then you can add a signature to the group you want. But it will only add the signature when you use tapatalk, if you ever log in on a computer it will not input the signature. Link to comment Share on other sites More sharing options...
Billabob Posted June 16, 2023 Author Share Posted June 16, 2023 1 hour ago, 87MJTIM said: The oval one is if you have cruise control. Not sure this is true since I have seen round ones with cruise control. My best guess is that the double nozzled ones are an inlet/hvac and the 3 nozzled one is inlet/hvac/cruise control. This one just has one inlet and no outlets. How does that work? 1 hour ago, cruiser54 said: HOrnbrod Apologies. I have a 1987 4WD Comanche. Cannister apparently is from a 1991 Comanche. Link to comment Share on other sites More sharing options...
87MJTIM Posted June 16, 2023 Share Posted June 16, 2023 Sounds like yours may have been changed in the past. Factory CC used the football reservoir. You indicated that the cannister is from a 91. Link to comment Share on other sites More sharing options...
eaglescout526 Posted June 16, 2023 Share Posted June 16, 2023 18 minutes ago, 87MJTIM said: Sounds like yours may have been changed in the past. Factory CC used the football reservoir. You indicated that the cannister is from a 91. Chrysler used the same shape football for their HOs. It can be confusing to those who aren’t familiar with parts(thanks Chrysler). OP, you will need the same shape canister but with 4 holes, two per side. They are getting harder to find these days. Link to comment Share on other sites More sharing options...
cruiser54 Posted June 16, 2023 Share Posted June 16, 2023 Billabob, do you have cruise? If not, here's a real easy way to upgrade and eliminate a bunch of troublesome plumbing. Link to comment Share on other sites More sharing options...
cruiser54 Posted June 16, 2023 Share Posted June 16, 2023 check this out. I cut a big one in half. It's basically 2 small cannisters in one. And, the "good" half of the can still works. Link to comment Share on other sites More sharing options...
Ωhm Posted June 16, 2023 Share Posted June 16, 2023 @cruiser54 Do you remember if that was that the CC side or the HVAC side of that vacuum reservoir you cut off? I'm wondering if both sides have the check valve. Link to comment Share on other sites More sharing options...
eaglescout526 Posted June 16, 2023 Share Posted June 16, 2023 31 minutes ago, Ωhm said: @cruiser54 Do you remember if that was that the CC side or the HVAC side of that vacuum reservoir you cut off? I'm wondering if both sides have the check valve. Wait….they’re different? I always figured they’re both the same. Link to comment Share on other sites More sharing options...
Billabob Posted June 16, 2023 Author Share Posted June 16, 2023 This is all great info. I do not have cruise control. I also do not have a CAD disconnect anymore. I'm trying to simplify the hoses as much as I can. What I’m still confused about is how a stock 1991 is routed if the cannister has a single “nub”. Is there no check valve anymore? I always assumed the HVAC remained the same throughout all the 1996-down years. How did they get vacuum for HVAC without a nub for it? Link to comment Share on other sites More sharing options...
Billabob Posted June 16, 2023 Author Share Posted June 16, 2023 As you can see, single inlet and no outlets. Link to comment Share on other sites More sharing options...
Ωhm Posted June 16, 2023 Share Posted June 16, 2023 I would think that the single connect is both the inlet and outlet, no check valve. With the double connect, one inlet and one outlet, that should have an internal check valve. Link to comment Share on other sites More sharing options...
cruiser54 Posted June 16, 2023 Share Posted June 16, 2023 Get this one and mount it under the coolant bottle. https://www.amazon.com/Dorman-HELP-47076-Vacuum-Tank/dp/B000COB8FA Link to comment Share on other sites More sharing options...
cruiser54 Posted June 16, 2023 Share Posted June 16, 2023 6 hours ago, eaglescout526 said: Wait….they’re different? I always figured they’re both the same. I don't remember Link to comment Share on other sites More sharing options...
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