Question about 1999 Chevrolet Blazer

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I need a vacuum line for a 2003 blazer 4x4 4wd

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ANY auto parts store will supply you with one,but you should take a "sample"peice to show them what size you need.

Posted on Dec 22, 2008


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1988 chevy s10 blazer 4x4 , 4x4 will not engage , changed most of the vacuum lines and still nothing ... aggravated

Have you checked the vacuum actuator under the battery? Battery acid will leak down and cause all kinds of issues with them.

I’m happy to assist further over the phone at

Sep 26, 2010 | 2003 Kia Spectra

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I have a 91 s10 Blazer 4.3 4x4. I need to find out where the vacuum lines go from the switch on the transfer case to the engine go. When I got the Blazer the vacuum lines were gone.

You should go to a salvage yard and get the plug that plugs into the top of the transfer case.It is a 3 line plug and it is a molded rubber plug.The lines go to the actuator.Which is under the battery tray.The other goes to engine vacuum.The other tees off to the vent pipe on the rear of the transfer case and atmosphere.That`s why I suggested the salvage yard.Hope this helps.Good luck.

Dec 20, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

2003 Blazer - Oil coming from climate control vacuum connector

May sound silly but take a short length of hose and put one end to your ear and use the other end to probe for the leak. It will be substantially louder as you get nearer to it. As far as the oily stuff in the lines, I can't think of anywhere it could be coming from unless the master cylinder is leaking into the power booster and somehow getting into vacuum lines...but this should not happen because any fluid in there would be drawn into the engine, and, the master would be low??? Try to find the leak first and deal with the other thing may turn out to be a "nothing" item.

Apr 15, 2009 | 2000 Chevrolet Blazer

1 Answer

Push button selectors do not shift transfer case from 2WD to 4WD. Rumor has it that moisture is in the vacuum line.

Under the battery there is a electronic vacuum valve that engages the 4wd,thes often go out,and your shift buttons will still show that 4wd is engaged,but isn't.I have had several s series blazers,and this component has failed on most of the trucks.

Apr 13, 2009 | 2003 Chevrolet Blazer

1 Answer

2003 vacuum line i dont know where it goes???

local libarary they should have chiltons for u to use and possibly the one u need

Dec 16, 2008 | 1999 Chevrolet Blazer

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