Air Conditioner Hissing

[powshocker]

So I"m trying to figure out where the hissing is coming from.

When the A/C is on, it blows nice and cold. When I turn it off the A/C there is a hissing that is constantly making noise, while the engine is running. Not sure if that's a sign of low freon, a vaccuum leak or an A/C part going bad. Anyone have any ideas or experience with the same issue?

Thanks in advance for any solutions.
BB

 

[db239]

Re: Air Conditioner Hissing

Common problem, here is the part you need.

16047875
gmpartsdirect.com
$9.24

 

[Mobile22]

Re: Air Conditioner Hissing

The hissing is a vacuum leak that's more than likely coming from your A/C control panel in the dash. It uses vacuum to actuate as you change the settings. You can remove the panel and GENTLY check to see that the lines are plugged all the way in. If not you can try using a tool to pull them in to seal it.

 

[Brassmonkey]

Re: Air Conditioner Hissing

Sometimes you will hear hissing when the system is equalizing also. Nothing to worry about.

 

[randy merritt]

Re: Air Conditioner Hissing

On my sy, I have to move the selector lever slightly "up" from the off position when I turn my a/c off. If I don't move it slightly up, there is a constant hissing sound which is a vacuum leak on the slide controls. Try that.

 

[Kaiesis]

Re: Air Conditioner Hissing

Mine hisses as well. When I turn it off theres a "hissssss" then it stops. Is that normal or is there a vaccume leak as well?

 

[Static]

Re: Air Conditioner Hissing

Normal