1999 GMC Jimmy Vacuum Line Ventilation Control

[@larrybrenner4379]

Robot Thank you for showing the routing of the vacuum hoses. I have just finished replacing the intake manifold gaskets on my 99. Upon finished I could not find the home for one hose. Your video showed me and you said one goes down to the engine; it would be the manifold. Pulled the top radiator hose up and there it was. I also changed the timing chain #CCA-3202 it is a Compcams chain. much better them the roller OEM chain. I was also able to change the gaskets without tearing the intake down. Cleaned it all up and did a couple of dry runs before I placed the gaskets on the heads. Timing chain; directions wanted you to drop pan or pull engine. I cut the thick gasket out, and cleaned surgically with cleaner and put a coat of the right stuff gasket maker on and let it dry for a couple of days. Also sanded the surface of the new plastic cover were it contacts the removed seal. Also coated it with gasket maker and let dry. Was generous when reassembling with gasket maker. Let it dry a couple of days also. It is always interesting when reading comments, I am sure a few of you won't like this method. Ebb

[@ernestyagger3774]

Thanks for the info. I like the idea of the red vacuum lines, it makes it a great deal easier to scope the system out.

[@scottlawder7617]

I have the same issue on my S10 96 Vortec 4.3. This was helpful.

[@Blueknight1960]

Everything works on mine except for the footwell. The front vents work and the defrost vents, just no air to the footwell. Also the heat and a/c works great. Any idea what I need to check?

[@joebagofdonuts1453]

where doid you get the red vacumn lines from?? what store???

[@idv1328]

Amazon has them. That’s where I got mine

[@alberteinstein3078]

What size are the vacuum lines?

[@stevegabriel7164]

I'd also like to know 😃

[@stevegabriel7164]

Loved the video!! Thanks! I'm trying to replace mine. Could you provide the size(s) of the hose(s) please!! 😀

[@toddsiller1790]

I need to do mine

[@markstrohecker5342]

I have a 99 jimmy and i am having kinda same issue.I wasnt sure but i was looking at all those lines and saw they are all dry rotted and easily crumbling .It may just be my issue and i am gonna replace them today cause i knew one was for the 4x4 and thought others went tothe wipers which they may cause my wipers run funny..So it has to be a vacuum problem..Thanks