I was under the truck taking off my front skid plate to polish it up real nice. Anyways saw a vacuum hose hanging. My truck has the smog pump/secondary air injection system. I am pretty sure this is the vacuum supply line for the solenoid but it looks like the nipple is broken off. the 3 inch line from the solenoid to the valve was there (dry rotted so i replaced).

Can someone help me confirm that the vacuum solenoid has in input and an output before I take a ride to the bone yard to find one? I cant find a good picture of one online.


I plugged the line up top and man my heat works GREAT now haha. So glad i found this leak. everything runs better now.

 

Not sure if this will help, but check out post #17:

https://blazerforum.com/forum/2nd-ge...e-69344/page2/

The solenoid has an input and an output - it's basically a switch that opens and closes the vacuum supply.

 

yeah thats it. it looks like there is supposed to be 2 side by side nipples. one coming from the top of the engine and the other going to the valve. Thanks