Vacuum Leak or Normal.
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Freshman User
Joined: Sep 2014
Posts: 32
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Vacuum Leak or Normal.
Hi Folks, As I continue to learn about my "new" truck, I keep finding things that worry me. I suspect I have a vacuum leak somewhere because the truck has a rough idle (runs great at higher speeds). I have noticed that there is a constant vacuum (sucking) sound coming from my ventilation controls, even in the off position. The fan, selector and vents all work fine but I don't know if this noise is a leak or if it is supposed to make noise. After I shut off the engine the noise continues for a few more seconds then stops. Any advice would be appreciated!
Mountain Pass
Joined: Dec 2006
Posts: 196
Likes: 1
From: INYOKERN, CALIFORNIA
A/C
Indeed, it sounds like you have a decent sized vacuum leak! Something behind the dash is not connected, or one of the vacuum servos is leaking. Also find the vacuum resevoir(looks like a tomato juice can) and make sure there are no holes anywhere in the can. Good luck! Dale
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