What is the ball hanging under my car
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Junior Member
Joined: May 2018
Posts: 3
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From: Maryland
Car: 86 camaro sport
Engine: Gen 1 350
Transmission: 700r4
What is the ball hanging under my car
i have been removing things from my engine bay that i don’t need in order to clean things up and I noticed this ball hanging under my driver side just behind the bumper. The ball has a thin hose coming from it and it runs to the intake manifold and a wire that goes to the harness. Do i need this or can I remove it ?? It’s right below the cruise control.
Joined: Dec 2004
Posts: 16,734
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: What is the ball hanging under my car
The vacuum ball is for the cruise control.
Joined: Jan 2013
Posts: 3,038
Likes: 52
From: Newtown, CT
Car: 1987 IROC Original Owner
Engine: LB9
Transmission: M39 MM5
Axle/Gears: G80 G92 J65
Re: What is the ball hanging under my car
And to think I was afraid to open this thread based on the title. 
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Thread Starter
Junior Member
Joined: May 2018
Posts: 3
Likes: 0
From: Maryland
Car: 86 camaro sport
Engine: Gen 1 350
Transmission: 700r4
Re: What is the ball hanging under my car
is there any point in having it if all my AC components have been removed and my cruise control has also been removed? The line going to the ball is pretty dry rotted and pinched, I could replace the line or just remove it all. What do you suggest?
Joined: Apr 2000
Posts: 3,938
Likes: 99
From: Huntsville AL
Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: What is the ball hanging under my car
"Also for the HVAC door motors."
And if you remove it, when accelerating up a hill, the heater doors will start switching from floor to default Defrost position due to lack of vacuum. That's why it's called a vacuum reservoir.
And if you remove it, when accelerating up a hill, the heater doors will start switching from floor to default Defrost position due to lack of vacuum. That's why it's called a vacuum reservoir.
Joined: Oct 2001
Posts: 12,212
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Joined: Apr 2000
Posts: 3,938
Likes: 99
From: Huntsville AL
Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: What is the ball hanging under my car
Joined: Sep 1999
Posts: 4,353
Likes: 308
From: NJ
Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: What is the ball hanging under my car
I tried that and it's false. I put the AC on max when I left work and held the car against the rev limiter and it didn't switch to defrost at all. 6000 rpm with my 4.8 LR4. Heating system is stock except I removed the vacuum ball, and I don't have the vacuum cruise either.
Joined: Apr 2000
Posts: 3,938
Likes: 99
From: Huntsville AL
Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: What is the ball hanging under my car
I tried that and it's false. I put the AC on max when I left work and held the car against the rev limiter and it didn't switch to defrost at all. 6000 rpm with my 4.8 LR4. Heating system is stock except I removed the vacuum ball, and I don't have the vacuum cruise either.
I stand corrected.
My friends Grand Cherokee had a cracked reservoir and going up long grades, his did that. Must be a Jeep thing.
Joined: Jan 2005
Posts: 10,404
Likes: 492
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: What is the ball hanging under my car
I have a LT4 Hot Cammed 87 TPI 350 Firebird that could not keep the blend doors actuated until I hooked up a brake vacuum canister and hooked the blend door vacuum hose up to the brake booster using a check valve from a random Dodge truck. Newer 2000s Dodge trucks store their vacuum in the brake booster for their a/c system. GM systems all default to defrost if they lose vacuum, actually I believe it was a goverment mandate back in the day that ALL cars and trucks did.
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Joined: Dec 2016
Posts: 252
Likes: 5
From: cincinnati ohio
Car: 1987 Trans am GTA
Engine: 5.7 liter
Transmission: 700r4
Axle/Gears: 3.27
Re: What is the ball hanging under my car
I've had mine out for a few months now and havnt noticed any issues, but I don't use the heat or a/c.
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