vacuum ball?
Thread Starter
Melting Slicks
Joined: Oct 2006
Posts: 2,193
Likes: 156
From: Navarre FL
vacuum ball?
78 L48. Bought the car as a non rolling project and I have a back plastic ball with various other parts in the back of the car. Its fairly clean, so assuming it is actually from this car then it must have been an interior part. Its roughly a 4-5 in ball with a mounting tab on one side and a port labled "VAC".
I have tried searching and cannot seem to find what this part is. Anyone have some insight?
I have tried searching and cannot seem to find what this part is. Anyone have some insight?
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
Congratulations on the 78. Purchase the assembly instruction manual (AIM) for it. You're going to want the AIM for more than parts identification.
Post a pic of your 4-5" ball. It does not sound like a Corvette part.
Post a pic of your 4-5" ball. It does not sound like a Corvette part.
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
Thread Starter
Melting Slicks
Joined: Oct 2006
Posts: 2,193
Likes: 156
From: Navarre FL
Im thinking C4 as well. I have looked through the AIM and FSM and didnt see anything. Its pretty difficult to look for a part in the AIM if you dont know what it goes too though I figured folks on here would have the answer. There is also a handful of clipped wires I cant seem to identify with wiring diagrams either. Lots of fun taking over a project! 
I figured folks on here would have the answer. There is also a handful of clipped wires I cant seem to identify with wiring diagrams either. Lots of fun taking over a project!
Drifting
Joined: Apr 2003
Posts: 1,698
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From: Johnson City TN
Le Mans Master
Joined: Oct 2006
Posts: 6,842
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From: Palmdale CA
http://forums.corvetteforum.com/c4-t...cuum-ball.html
Question:
"Anybody know what the softball sized plastic ball w/ vacuum line in left side front wheel well is for? I have one in my '86 that was badly cracked. Fixed the vacuum leak (it's T'd with the cruise control modulator) and was wondering what it did -- assuming it's some kind of accumulator. My Haynes manual doesn't cover it, maybe need a Helms... "
Answer:
It's the vacuum canister for the cruise control.
Follow the vacuum line from the right rear of the plenum, through the check valve to the left side of the inner fender well, where the line splits and goes forward to that canister and up to the curise control servo. FYI, the other line from the cruise control servo goes through the firewall to the brake switch.
It so happens that I recently had to trouble shoot the cruise control on my '88.
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