Cowl Vacuum Plugs
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Senior User
Joined: Jul 2010
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From: Connecticut
Cowl Vacuum Plugs
Under the hood p by the cowl there are 3 places to connect vacuum lines to for various diagnostics. In my truck the 2 longer connectors have caps over them, but the shortest does not. Does anyone know if this is supposed to be uncovered or not?
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Joined: Apr 2009
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From: Illernois
Yep thats your vaccum tree. If you have one thats just sitting there open then hurry up and get a cap on er! Your truck will appreciate it and you will too lol.
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Correct. If your HVAC (Heater - A/C controls) are non functional, this area is the first place to look.
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Joined: Dec 2007
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From: Lost
While everything listed above is spot on, I do have to ask this. 2 of 3 are capped and 1 is open. If you mean capped in the way I think of capped, that means using a cap to block an open port. If so, that means there's no vacuum at this tree, so no need to worry about the open port.