hissing behind HVAC controls even when off..help???

[vandelay101]

Hey everyone,

Storing my car for the winter and when I've been running it lately in the garage I've noticed a loud hissing coming from right behind the HVAC controls even when the fan is completely shut off and everything is in the off position. I've also noticed when I turn the HVAC to the Vent position, in the middle I believe, it hardly blows. AC blows really hard. Not sure what this is. Possible just a hose behind there is broken or off the control??? Let me know guys.

Thanks in Advance,
Rob
1995 Camaro 3.4

[Distephano]

Sounds like it could very well be a Vac. leak of some sort. I'd pull out the pannel and start checking the lines behind it.

[Die Ford V8]

look under your windshield (open your hood) and look at the vacuum lines above the right front tire fender well. i bet the little three way valve is in pieces. i would also pull the panel off that is located above your passengers feet and look at all those lines.