Thread: weird hissing in dash...

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  1. #1 weird hissing in dash... 
    GTP Level Member 2000GTP's Avatar
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    when my a/c and all fans and everything are off i get this hissing sound in my dash... ive been hearing it since i bought my car which is in my sig. and cant figure out what it is! anyone know anything about this???
    2000 GP GTP Black 2 Door AEM Meth Injection (100% Meth), 3.25" pulley, N* TB, PRJ Wires, Smoothflow Idlers, 42# injectors, Racetronix fuel pump, ZZP Headers, 1.8 Roller Rockers, Custom CAI, NGK TR6 Plugs, 180* Tstat, Custom Tuning by TUNE TIME PERFORMANCE
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  2. #2 Re: weird hissing in dash... 
    GTP Level Member 2000GTP's Avatar
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    guessing nobody knows!
    2000 GP GTP Black 2 Door AEM Meth Injection (100% Meth), 3.25" pulley, N* TB, PRJ Wires, Smoothflow Idlers, 42# injectors, Racetronix fuel pump, ZZP Headers, 1.8 Roller Rockers, Custom CAI, NGK TR6 Plugs, 180* Tstat, Custom Tuning by TUNE TIME PERFORMANCE
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  3. #3 Re: weird hissing in dash... 
    GTP Level Member Scimmia's Avatar
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    Vac leak? A vac line runs into the dash to actuate the doors for the HVAC system.
    2001 Buick Regal LS - Almost Stock
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  4. #4 Re: weird hissing in dash... 
    GTX Level Member DanGTP's Avatar
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    Do all of your heater controls work properly? For example: If you set the AC to blow all out the upper vents, does it blow out the floor and/or defroster outlets? What kind of noise does it make when you shut the car down? Does it stop immediately, or does it continue for a second or so?

    I'm going to agree with Scimmia and say it's probably a vacuum leak at or near the vac port of your heater controls.
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    '97 GTP: 9.5:1 Diamonds, P&P Everything, XP, SSIC, GenV, Shiny Headers, 3.29's, HPTuners, E85
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  5. #5 Re: weird hissing in dash... 
    GTP Level Member 2000GTP's Avatar
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    ill check all that stuff today. I know that the A/C wont blow cold, but when my mechanic turned it on with a scanner it did. How hard would it be to fix a vacuum leak like that?
    2000 GP GTP Black 2 Door AEM Meth Injection (100% Meth), 3.25" pulley, N* TB, PRJ Wires, Smoothflow Idlers, 42# injectors, Racetronix fuel pump, ZZP Headers, 1.8 Roller Rockers, Custom CAI, NGK TR6 Plugs, 180* Tstat, Custom Tuning by TUNE TIME PERFORMANCE
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  6. #6 Re: weird hissing in dash... 
    GT Level Member SliceTheRice's Avatar
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    Reviving an old thread here. I'm also having a weird hiss in the dash that sounds like a pissed off snake. It only happens when the AC is on, and it's not consistent. It randomly starts hissing, will get really loud and then fade to nothing. It does that every few minutes with no real pattern. AC seems to function totally fine too. Thoughts?

    2000 Pontiac Grand Prix GTP
    (3.4 MPS, DHP 1.0 tune, ZZP Plog & 3" DP, 2.5" cat-back exhaust, resonator delete, AL104 plugs, 180* T-stat, Falken Ziex 245/45/18 tires)
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