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Old 04-05-2013, 07:11 PM
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Default heat only blows out of defroster

Just bought a 95 Blazer, with the understanding that there were multiple minor issues with it. This one has me slightly stumped however. My heat only blows out of the defroster vent (which I understand is the default when there is a vacuum issue). After some poking around on the forum and under the hood, I found the hose coming off the back of the upper intake manifold lead to a "T" fitting which the previous owner had apparently put 2 screws into. My question is, where are these lines coming off the T with the screws in it supposed to go to? And I suppose also any reason you folks can come up with why the screws might be in this T-fitting?

Pic of the T-fitting with the screws in it: http://i46.tinypic.com/2j1absg.jpg

It's the clear hose (lower in this pic) off the back of the intake manifold that leads out to the T-fitting with screws: http://i46.tinypic.com/5nsruq.jpg
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Old 04-06-2013, 10:30 AM
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I have a 98 but that looks like the "T" fitting that's by the drivers fender and master cylinder, one end goes into the fender to a canister I think. I don't have pics on this computer but let me see what I can come up with here in a bit.
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Old 04-06-2013, 11:54 AM
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Does this help.
Attached Thumbnails
heat only blows out of defroster-vac-line-1-.jpg   heat only blows out of defroster-vac-line-2-.jpg  
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Old 04-07-2013, 02:09 PM
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Here are some pics and diagrams from my 1996 Sonoma 4x4.
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Old 04-08-2013, 02:51 AM
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Both those posts are exactly what I was looking for. Thanks guys. It's dark now, but I have tomorrow off so hopefully I'll have some time to check this out on my end. I'll post what I come up with for results. Oddly enough, given where these vacuum lines run to, my 4WD works fine.
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Last edited by BreenBoyRT; 04-08-2013 at 02:54 AM.
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1995, 1998, 96, 98, actuator, blazer, blows, chevy, defrost, defroster, heat, sonoma, switching, vent


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