Need help… what is this dang thing!

[Grandpa_truck]

Help needed! I’m at a loss, I can’t figure out what this thing is, pretty sure it’s not an EGR or PCV (I know where those are and that’s not it… or is it), maybe some kind of purge valve? Cant find it on parts list anywhere. Anyone?
The hard plastic hose with arrow on the right must have been brittle and broke, I need the hose but again…No idea what that valve thing is to look it up! The other side of that hose goes to the throttle body next to PCV hose. Anyone know what that valve/solenoid/pump thing is and/or where I can find a replacement hose. I’m assuming anything that small doesn’t move or pull a whole lot of volume so I can probably just use some hose but I dont prefer hodgepodge work.
The 2 other hoses that come off it are 1 full rubber going to air cleaner housing, the 2nd metal/rubber hose running down to an open 90 degree that is open and goes nowhere. Any help appreciated

 

[b454rat]

Dunno what it's called but its for the heater flow. It's vacuum operated, and it opens or closes a valve depending what the temp is at.

 

[Deancr11]

I'm guessing heater control valve but I'm usually not correct

 

[movietvet]

Post the part number off of it.

I am thinking, to do with emissions but am unsure.

 

[62barsoom]

I have one on the 99 tahoe, but not on the 97 truck. The Tahoe has rear heat and ac. The other end definitely ties to vacuum so I'm thinking it helps control the rear set. What vehicle do you have?

 

[JDGMC]

Electric Air Control valve (EAC). Part of the Air Injection Reaction (AIR) system, adds air to the exhaust manifold after the exhaust gases leave the combustion chamber. Heats the catalytic converter quicker when the engine is cold. The system is comprised of an air pump, an electric air control valve with a solenoid, check valve(s), and tubing/pipe.

 

[GrimsterGMC]

Electric Air Control valve (EAC). Part of the Air Injection Reaction (AIR) system, adds air to the exhaust manifold after the exhaust gases leave the combustion chamber. Heats the catalytic converter quicker when the engine is cold. The system is comprised of an air pump, an electric air control valve with a solenoid, check valve(s), and tubing/pipe.

That's what it is.

 

[GoToGuy]

Are you doing your own work/ maintenance? Do you have the factory service manuals? Without knowing what , year, make, model, you can get guessing rather than answers.

 

[Grandpa_truck]

Are you doing your own work/ maintenance? Do you have the factory service manuals? Without knowing what , year, make, model, you can get guessing rather than answers.

Yes doing the majority of my own work and its an 88 sierra TBI 5.7 350 2wd drive with AC

 

[Grandpa_truck]

Electric Air Control valve (EAC). Part of the Air Injection Reaction (AIR) system, adds air to the exhaust manifold after the exhaust gases leave the combustion chamber. Heats the catalytic converter quicker when the engine is cold. The system is comprised of an air pump, an electric air control valve with a solenoid, check valve(s), and tubing/pipe.

That’s what I was thinking but can’t find it on any parts diagram or even pictures on Google look nothing like it. It’s got me stumped

Electric Air Control valve (EAC). Part of the Air Injection Reaction (AIR) system, adds air to the exhaust manifold after the exhaust gases leave the combustion chamber. Heats the catalytic converter quicker when the engine is cold. The system is comprised of an air pump, an electric air control valve with a solenoid, check valve(s), and tubing/pipe.