HVAC vacuum from LS

[TubeTruck]

Since winter is coming, heat and a defroster would be nice. How did you guys with an LS hook up the vacuum line? I'm thinking about using the push-to-connect port on the back of the intake. I can't find any other vacuum sources.

 

[Matt69olds]

I would think any manifold vacuum source would work. Just make sure the vacuum ball and check valve are in place

 

[SteveLNew]

Do you really need the vacuum ball to make this work?
( my 1st post here )

 

[RoryH19]

Since winter is coming, heat and a defroster would be nice. How did you guys with an LS hook up the vacuum line? I'm thinking about using the push-to-connect port on the back of the intake. I can't find any other vacuum sources.

For my 6.0 ls swap I took vacuum from the manifold where the Evap solenoid was located. Used a brass barb. Then ran the line to a vacuum ball. Then tied into original HVAC.

 

[bucket]

Do you really need the vacuum ball to make this work?
( my 1st post here )

Without the vacuum ball and check valve, your HVAC system will loose vacuum whenever you get on the throttle. So anytime you accelerate, air will stop blowing out of the correct vents and blow out somewhere else.