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Vent whistling noise

 
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Old 26 Mar 2015, 05:30 pm
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Location: Windsor Ontario Canada
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Default Vent whistling noise

Hey guys, I did a quick search with no results. I recently purchased a 2004 gt and just within the last week I've noticed that there is a whislting noise from the ac vents when at idle and it goes away when accelerating.. I know its a vacuum leak but I'm not really sure where to look. I have a boost gauge installed and at idle it's showing about 17 vacuum and under WOT it's only boosting about 13psi. Is this normal?
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Old 27 Mar 2015, 03:38 am
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Default Re: Vent whistling noise

Great color - very rarely seen in Germany. Very beautiful.
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Old 13 Apr 2015, 07:06 pm
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Default Re: Vent whistling noise

at wot does it stay at a certain psi or does it drop or give a drastic different reading? If you have an air tank you can make a make shift pressure tester for boost. Just get you some pvc pipe, a quick release fitting for air line. Take off your intake piping and hook these items to the turbo inlet. Dont run too much pressure thru it, just run about 18-20 psi If your goal is 15. get some soapy water mixture in a squirt bottle and start spraying your lines. You will instantly see if you have a leak.
On a side note. I noticed you have the same rear roll pan/bumper as I do. Very nice.
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Old 20 Apr 2015, 11:11 am
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Default Re: Vent whistling noise

Quote:
Originally Posted by Turboguy85 View Post
at wot does it stay at a certain psi or does it drop or give a drastic different reading? If you have an air tank you can make a make shift pressure tester for boost. Just get you some pvc pipe, a quick release fitting for air line. Take off your intake piping and hook these items to the turbo inlet. Dont run too much pressure thru it, just run about 18-20 psi If your goal is 15. get some soapy water mixture in a squirt bottle and start spraying your lines. You will instantly see if you have a leak.
On a side note. I noticed you have the same rear roll pan/bumper as I do. Very nice.
I found the culprit, it's my switch that controls weather you have fresh air from out side or if it recirculates. If I put it in a certain spot the whistling goes away... I'm assuming I have to replace the entire climate control assembly..
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Old 20 Apr 2015, 12:28 pm
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Default Re: Vent whistling noise

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Originally Posted by GreatWhitePT View Post
I found the culprit, it's my switch that controls ...fresh air from out side or if it recirculates. ... I'm assuming I have to replace the entire climate control assembly..
Likely you have correctly identified a vacuum leak.
I doubt that the climate control panel needs to be replaced. It does need to be removed to access the back where a 'vacuum harness' plugs in. Another end of the same harness system can be seen when you remove the glove box. Look for the metal actuator canister (opens closes fresh air door).

Finally, the vacuum source is seen by the brake master cylinder. See the vacuum canister and tube in the pic below. The vacuum tube passes through a firewall grommet.
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