Hissing sound behind the instrument panel
My 2003 GC Laredo 4L has a weird sound behind the instrument panel, somewhere behind a glove box. Sounds like hissing or breathing, as if some sort of a vacuum system has a leak. It's on when engine is running, even when heater-A/C is off. It's quite loud.
I got manual heating system.
Any ideas what can it be?