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#1 |
Registered User
Join Date: Feb 2006
Location: Saint Louis
Posts: 84
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emissions device
76' 1/2 ton cheyenne 350 orginally a 2 barrel. There is a black plastic round (it's not the vapor canister) device at the side of the a/c core on the firewall. there is one vacuum line coming from it going to the tee where the modulator is at the back of the intake. I was wondering what this device actually is and what it does??? thanks in advance. Matt.
Last edited by rapidride3; 11-25-2006 at 09:52 PM. |
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#2 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: emissions device
It is a vacuum canister. It holds a small amount of vacuum to keep the internal components in the cab from actuating when the engine goes through different changes (acceleration and climbing hills, etc...). It is just a small tank, that is all.
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#3 |
Registered User
Join Date: Feb 2006
Location: Saint Louis
Posts: 84
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Re: emissions device
thanks alot,,, i guess i should keep it in service on my truck for now since it may have something to do with the defrost/air cond./heater ,,,maybe when i switch the selector for whatever vents/doors to open or shut??? Thanks for the expertise. I had no idea???
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