skyhighsami

iTrader: (8)

I was going to Seafoam my truck and went to disconnect the vacuum line off the master cylinder and guess what....no vacuum line there. So I just bought the truck and haven't really been able to mess with it with work and all so I haven't spent much time looking honestly. What would be the best vacuum source under the hood to pour the Seafoam in the clean the vacuum system? Thanks

GMCtrk

iTrader: (27)

brake booster line

thunder550

iTrader: (70)

Your truck must have hydroboost instead of vacuum booster.

There should be a PCV line that goes from the back of the driver's side valve cover into the manifold somewhere (I think it's on the very top). Try that one instead.

skyhighsami

iTrader: (8)

Thanks, yeah the truck does have Hydroboost so the brake booster wouldn't work. Thanks for the valve cover line tip, I wasn't sure it was would be enough of a source of vacuum.

budhayes3

iTrader: (19)

+1 PCV hose will work