Does anyone know what this is or the purpose???

 

I really cant see it all that well in the pic but i would say its a vacuum reservoir. It keeps reserve vac so that all vacuum controlled items in the car can function at low vacuum situation such as WOT.

 

thanks for the quick reply!

I understand its probley not necessary , ive never seen one on any camaro before...

The vacuum lines were rotted so i caped it off..

 

yeah, you dont really need it unless your running cruise control. with out it your HAVC mode door and blend door might change positions temporarily under heavy acceleration but that would be the worst of it. this was on the earlier camaros. it was replaced by the infamous mystery vacuum ball on newer models.

 

yeah, you dont really need it unless your running cruise control. with out it your HAVC mode door and blend door might change positions temporarily under heavy acceleration but that would be the worst of it. this was on the earlier camaros. it was replaced by the infamous mystery vacuum ball on newer models.

 

Thanks again man!

 

If you could get a better picture we might be able to give a better suggestion.

 

You need it.

It is indeed the vacuum reservoir, with built-in check valve.

It has nothing whatsoever to do with the cruise control.

What it DOES do however, is to store up enough vacuum for the HVAC system controls, to where when you accelerate, all your little air doors under the dash, don't go back to their "rest" positions.

 

is this still necessary if i do not have ac?

Also, what is the routing for this it seems there are two hoses,
---one direct manifold and one back to pcv??--

 

Yes it is necessary. (to the extent anything is "necessary"... there's only ONE action in life that's mandatory, and all else is just a matter of choices and consequences)

You need it.

The inlet port goes to the port on the manifold behind the carb (that's the vacuum source), the other goes to the HVAC control head.

 

I broke the nipple off my Vacuum reservoir, i have the same one in ops pic above. I bought the big vac res ball thing and it only has one input and no output. What am i supposed to do with that ? The vac res on the firewall has an input for vac from intake and out to heater control. ???

https://i.imgur.com/gideluc.jpg

 

If memory serves, the ball type uses an external check valve; you can get those in the Help! aisle at yer corner parts store.

 

How do i hook it all up ? Manifold vac line to the new round res and then what ? Would i put in a T then connect the vac line from the heater to the T ? And install check valve on which line ? Manifold to res ?

 

Manifold vac to check valve inlet; outlet to a T; one side of the T to the ball, one side to the HVAC & cruise supply lines.

The purpose of the check valve is to only allow vacuum into the ball, not back out into the manifold when the manifold vacuum drops. The purpose of the ball is to hold enough vacuum to keep the accessories working when vacuum goes away. (i.e. when you accelerate)

 

Right on, thankx !