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Author Topic: Hiss noise when changing air direction?  (Read 1244 times)

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BruceT

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Hiss noise when changing air direction?
« on: 26 June 2008, 20:38:42 »
In relation to this thread started by me: http://www.omegaowners.com/forum/YaBB.pl?num=1213879820/3#

Well, how weird!

Was driving in Asda car park and the front screen was misting up slightly.

The blowe fan speed was on 0 and the air direction was on face. I changed the air direction dial to the defroster vents and hissssssed at me like air was been released, its only quiet. I thought weird, ill try it again.
Same thing, whenever I go from air posistion from front blowers to the defroster ones it hisses.

Air leak?

Where should I look?

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1999 Omega 2.0 16v CD

hotel21

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Re: Hiss noise when changing air direction?
« Reply #1 on: 26 June 2008, 20:41:04 »
Check the face level vents are fully open or fully closed.  can make a similar noise if they are only open a slight crack.....
« Last Edit: 26 June 2008, 20:41:34 by hotel21 »
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BruceT

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Re: Hiss noise when changing air direction?
« Reply #2 on: 26 June 2008, 20:49:28 »
Quote
Check the face level vents are fully open or fully closed.  can make a similar noise if they are only open a slight crack.....
All the vents are fully open
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Jimbob

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Re: Hiss noise when changing air direction?
« Reply #3 on: 26 June 2008, 20:53:18 »
press and hold auto and off for 10 seconds to reset the servo's, may help
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BruceT

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Re: Hiss noise when changing air direction?
« Reply #4 on: 26 June 2008, 20:54:25 »
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press and hold auto and off for 10 seconds to reset the servo's, may help
Auto and Off?

I dont have climate, just normal Air con each side...
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Debs.

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Re: Hiss noise when changing air direction?
« Reply #5 on: 26 June 2008, 21:30:55 »
Mine does that too; in particular when I switch from re-circ to fresh air intake (using the re-circ button).....I think it`s the sound of a vacuum servo being opened to atmosphere.....my previous aircon (non climate) Omega did it too.
Perfectly normal operation I thought. ;)
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Marks DTM Calib

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Re: Hiss noise when changing air direction?
« Reply #6 on: 26 June 2008, 21:33:22 »
If its a continuous hiss then the vac pipe assembly may have come off the back of the direction controls (can be disturbed when radios are hand fistedly fitted!).

A short hiss is down to the vac bing released at the back of the selector switch and is perfectly normal.
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BruceT

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Re: Hiss noise when changing air direction?
« Reply #7 on: 26 June 2008, 21:46:40 »
Quote
If its a continuous hiss then the vac pipe assembly may have come off the back of the direction controls (can be disturbed when radios are hand fistedly fitted!).

A short hiss is down to the vac bing released at the back of the selector switch and is perfectly normal.

Its only short, like a mini dump valve!

Glad its normal!

Thank you!
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mike213735

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Re: Hiss noise when changing air direction?
« Reply #8 on: 26 June 2008, 22:03:02 »
Post Hijack alert!

I am unable to get any air through to my face vents and found that it is a vacuum hose missing off the back of the position selector. Probably yanked off when the hands free kit was removed before I bought the car. I am unable to retrieve it through the back of the dash and when I took the glovebox out to try to find the other end, I was greeted with a mass of pipes and wires.
Does anyone know where the other end of the facial selector hose goes and what / where should I be looking. Then I could just run a new length of hose and get it sorted.

Thanks
Mike
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