Vacuum Ball Function

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565bbchevy

Geezer
Aug 8, 2011
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What is the function of this vacuum ball mounted to the front core support in my 86' Regal?
So basically what do I need it for.
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yourownself

Master Mechanic
Sep 8, 2008
336
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stoughton, ma
It keeps your car from exploding. No, seriously tho, it’s a vacuum reservoir. If you don’t like the look of it, hide it. You need it if you run pretty much anything that uses engine vacuum.


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fleming442

Captain Tenneal
Dec 26, 2013
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It may have more bearing on the vacuum controlled cruise? Since my swap eliminated that, I hadn't reinstalled the ball. The only things vacuum hooked up are the vent selector and the brake booster. Then, during some hare-brained trouble shooting, I installed the ball, but mine is a single port. I teed it inline to the vent controls, and noticed no difference. Your results may vary.
 
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69hurstolds

Geezer
Supporting Member
Jan 2, 2006
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The idea is to be just as stated. A reservoir for vacuum. Similar to the way the brake booster works. As some of the vacuum-operated items are doing their thing, the hope is that the reservoir keeps the vacuum signal steady in relation to the engine vacuum. If vacuum fluctuates, you may start having those vacuum operations go snake shiit on you. Thus, customer complaints. Thus, engineers get yelled at. As far as how effective they are.....I guess the engineers figured they needed it.
 

565bbchevy

Geezer
Aug 8, 2011
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There is another one under the driver's side that appears to have a single hose going to it do one of these supply the AC?
 

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MrSony

Geezer
Nov 15, 2014
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Des Moines, Iowa
Ive always seen the 2 port balls (teehee) used for the hvac controls and the single port for cruise.
 

565bbchevy

Geezer
Aug 8, 2011
9,591
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Ive always seen the 2 port balls (teehee) used for the hvac controls and the single port for cruise.
I was also thinking that since they are on their respective sides of the car.
 

69hurstolds

Geezer
Supporting Member
Jan 2, 2006
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For cruise control vacuum system, you can use the 2 port check valve set up as shown or 3-port system shown in the inset which gets rid of the 2 port check valve.

2008-11-23_173435_SHOT0172.jpg
 
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TURNA

Rocket Powered Basset Hound
Jul 24, 2009
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Socialist NY
Single cruise double AC/Heat/DeFrost
 
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