Do you have the problem too, are you just saying? Haha well either way thanks cause I was about to ask that.

I thunk it might be the heater/ac controls because mines over on the passenger side. (the sound)

 

x2 on the cigarette smoke. Also if you're using a cigarette make sure you don't inhale the smoke just hold it in your mouth, that way it will come out of the leak much more dense and easier to see. it would really help if you could have someone blow the smoke for you while you look for the leak it will make it much easier to identify.

 

Theres a vacuum line junction block behind the glove box. See if a line popped off of it. I like the smoke idea. I'll have to remember that one.

 

That might be it! My passenger told me it sounded like it was coming from the glove box area. But from the drivers set it sounds like the havac controls area

 

Thats why I'm going to use a cigar. Plus the smoke is heavier and thicker.

 

That makes sense. The junction block is less than a foot from the controls.

 

Do it's behind the glove box? So I just pull the glove box out and I should be able to find it right?

 

Correct. You shouldnt have to remove it though. Just remove the stop and let it hang down. Mine is a white junction with 4 or 5 vacuum lines going to it. There is one unused vacuum port. Hope this helps.

 

I don't know if I'm just being dumb or what but I couldn't find what you were talking about.

 

FYI, if you have cruise control that can cause it as well. The diaphragm on the inside of mine was a little loose and it's got a little connector that branches off of it to run down to the AC vacuum lines. From inside the cab when you get to the little vacuum dispersing device it's the black line.

I never used my cruise control so I just disconnected it and vacuum capped it. Problem was solved and MPG's went up. I had your exact symptoms with the relation to RPM and the sound + AC switching to Defrost.

My little vacuum splitter connections were all fine. It was just a bad CC in my case.

 

Well I don't have cruise, but that doesn't mean that its not there...I'll check it out again today.

 

This is what I found, what I think are the vacuum lines, and there is one missing. And then is where I think the sound is coming from..

 

If the smoke doesn't come out from there, it's not your leak.

The smoke will come out the same place the sound is coming from.

Or - have you fallen for the "but I don't want it to be that" syndrome?

 

I had no cigars, I was just looking. And listening hahaha

 

That definitely looks like a problem to me. Red X's are never good.