Vacuum Ball Function

565bbchevy

565bbchevy

Geezer
Aug 8, 2011
6,325
113
Michigan
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.
20190413_173806-1_resized_1.jpg
 
Y

yourownself

Master Mechanic
Sep 8, 2008
340
28
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

fleming442

Geezer
Dec 26, 2013
6,476
113
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

69hurstolds

Royal Smart Person
Jan 2, 2006
2,134
113
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

565bbchevy

Geezer
Aug 8, 2011
6,325
113
Michigan
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

MrSony

Comic Book Super Hero
Nov 15, 2014
4,685
113
Des Moines, Iowa
Ive always seen the 2 port balls (teehee) used for the hvac controls and the single port for cruise.
 
565bbchevy

565bbchevy

Geezer
Aug 8, 2011
6,325
113
Michigan
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.
 
M

Max Headroom

Greasemonkey
Sep 8, 2011
127
28
I'm not sure which is which but I know one is for cruise control.
 
69hurstolds

69hurstolds

Royal Smart Person
Jan 2, 2006
2,134
113
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.

 
TURNA

TURNA

Geezer
Jul 24, 2009
7,831
113
Socialist NY
Single cruise double AC/Heat/DeFrost
 

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